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The recent discussions regarding baking breads in hot versus cold Dutch ovens - those from "Tartine Bread" in particular - prompted today's experiment.


I made two boules of the Country Rye from "Tartine Bread." One I baked starting in a room temperature enameled cast iron Dutch oven. The other I baked in the same Dutch oven, pre-heated. The breads were identical in weight. They were cold retarded overnight in bannetons and then proofed at room temperature for 2 hours before the first bake. The loaf baked in the pre-heated dutch oven proofed for 45 minutes longer, while the other loaf was baking. The second loaf was baked for 7 minutes longer than the first loaf, to get a darker crust.



Boule baked in cool Dutch oven on the left. Boule baked in pre-heated Dutch oven on the right.


In spite of the fact that the loaf baked first was relatively under-proofed, the loaf baked second, in a pre-heated Dutch oven, got slightly better bloom and oven spring. I won't be slicing these until next week. They are for my Thanksgiving guests. So, I don't know if there is any difference in the crumb structure.


Overall, I'm happy with both loaves. The differences are very small - arguably of no significance. While pre-heating the Dutch oven does appear to result in slightly better oven spring, the convenience of not having to pre-heat the Dutch oven may be more advantageous for many bakers.


Addendum: Okay. So, I'm weak. I had to try the bread, since it was the firs time I'd baked it.


The crust is crunchy-chewy. The crumb is less open than the "Basic Country Bread," as expected. The 17% (by Robertson's way of doing baker's math) whole rye does make a difference. The crumb is very cool and tender. The aroma is rather sour, but the flavor is less so. The surprise was the prominent whole wheat flavor tone, even though all the WW is in the levain, and it only amounts to 50 g out of a total of 1100 g (my way of doing baker's math). I expect the flavors to meld by breakfast time tomorrow. I think this will make great toast with Almond butter and apricot preserves.



Country Rye, cut loaf



Country rye, crumb


David


Submitted to YeastSpotting

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As most of you are aware, Thanksgiving is celebrated in the U.S. of A. next Thursday. Family gatherings and big dinners are traditional, although the foods that are traditional vary considerably by region and from family to family. These traditions usually involve a lot of cooking, but they make menu planning relatively simple, unless you have family members with a variety of food allergies or other aversions. 


There are also traditions regarding foods eaten, not on Thanksgiving, but on the surrounding days. I'm not aware of a lot of these. The one that comes to mind is going out for Chinese food the Friday after Thanksgiving. This is an American Jewish tradition. I have no idea what Chinese-Americans traditionally eat the night after Thanksgiving.


These days, with the increased mobility of American families, the Thanksgiving gathering often involves relatives traveling great distances in order to be together for the holiday. This also means the gathering is more than a one day affair. And that means meal planning and cooking need to be done for much more than the one big Thanksgiving dinner.


We will have family starting to arrive next Tuesday, and the last will leave the Saturday or Sunday after Thanksgiving. We want to have time to play with the grandchildren and visit with the grown-ups. So, we're spending this weekend preparing food to be frozen, so we don't spend all next week in the kitchen.


I started 2 days ago (Wednesday), feeding 2 different starters. Last night, I mixed the dough for San Joaquin Sourdough. This will be baked tomorrow as baguettes to make into French toast. Susan made a vegetarian stock to use for our Thanksgiving stuffing and for a potage. (One daughter-in-law is a vegetarian.)


Today, I built up a starter which will be used tomorrow to make Country Rye Breads from "Tartine Bread." I have the flour for this pre-weighed on the counter.


I also made a batch of NY Baker's babka dough and made up the cake crumb/sugar/cinnamon filling too.Tomorrow, I'll make up pecan rolls, but stop before cutting the rolls and freeze the logs to cut, proof and bake while company is here. 


I then made pasta dough for fresh tagliatelle for Tuesday night's dinner. The bolognese sauce is simmering now. I'll stir in some pesto before serving. (No pesto for the kosher daughter-in-law. It has cheese in it.) Tomorrow, I'll roll out, cut and dry the noodles.


I'd planned to also make a batch of the pie crust using trailrunner's recipe, but my wife hijacked the Cuisinart to grind hazelnuts for a Frangipani-Pear Cake. So, that's added to tomorrow's fun.



Sufficient excuse for not making pie crust today


Let's see ... That just leaves making Turkey stock (for brother Glenn's best ever gravy) and a big pot of Potage (from Patricia Wells. HIGHLY recommended!) for lunch or dinner one day, baking two kinds of bread, making the pie crust dough and putting together the pecan roll logs for the next two days. All this in between other necessary errands, naturally.


Hey! I forgot the bagels! Maybe we'll make them along with the Challah, rye bread, Apple Crostada and knotted rolls Glenn wants me to show him how to make ... next Friday. 


Happy getting ready for Thanksgiving to everyone!


David

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It's been quite a while since I've made a rye bread, and I've been missing it. I've been admiring the ryes other TFL members have been making, especially those with a very high percentage of rye. I've also noted the comments about the special sweet flavors reported when hot rye soakers or mashes have been included.


This weekend, I made Hamelman's “80% Rye with a Rye-flour Soaker” from “Bread.” This is the first time I've made a bread with over 70% rye flour and the first time I've used a hot rye soaker. The results were just astonishing. This is my new favorite rye bread.


I proofed the loaves seam side down, so the seam side was up when the breads baked. I did not score or dock the loaves but let them “burst” willy nilly. As occurred the last time I did this, I'd sealed the seams too well, and the loaves didn't burst as much as I'd hoped. None the less, I got really good oven spring, and the loaves had a high profile when sliced.




After the loaves were baked and cooled, I wrapped them in a spare raw linen couche for about 24 hours before slicing. The crust had softened and was nice and chewy. The crumb was pretty much as expected.



The flavor was notably sweet but with a nice tang and earthy rye flavor. It is delicious just plain and made a wonderful sandwich with smoked turkey breast. I'm anticipating great enjoyment when I have some with cream cheese and smoked salmon for breakfast tomorrow.



David


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I have made the Basic Country Bread from Chad Robertson's “Tartine Bread” twice before. (See: Tartine Basic Country Bread as Bâtards and Oven steaming using the SFBI method) However, I did not bake the loaves in the cast iron “cloche” that Robertson prescribes. I baked them on a pre-heated baking stone and used the SFBI oven steaming method or the "magic bowl" technique.


Caroline (“trailrunner” on TFL) recently blogged on Vermont Sourdough with Increased Whole Grain from Hamelman's “Bread” which she baked in Dutch Ovens – one cast iron and the other enameled cast iron. Her beautiful loaves finally pushed me to try this method with the Basic Country Bread. (See: David's Vermont SD w/ increased rye ---response to cast iron bake)


Caroline used an heirloom cast iron Dutch oven and a Le Creuset Dutch oven. There was no difference in her results. I decided to try a similar experiment with two other cloches: A 5 qt Copco enameled cast iron pot that was a wedding present (which means we've had it for going on 44 years) and a 4 qt Calphalon anodized aluminum all purpose pan.



Copco enameled cast iron on the left and Calphalon Anodized Aluminum Dutch Ovens


I made the dough according to Robertson's instructions. I followed Carolyn's well-described method for baking, except that I placed my cloches right on the oven rack, rather than on a baking stone.



Loaves uncovered after baking 20 minutes covered at 460ºF.


I baked the loaves for an additional 25 minutes after uncovering them to achieve the crust coloration seen below. I think I could have baked a bit longer to get as dark a crust as those in pictured in "Tartine Bread."



Loaf baked in Copco, on the left, and loaf baked in Calphalon, on the right


Both loaves had great oven spring and bloom. The one baked in the Copco oven had significantly great height, but I don't know whether this had anything to do with differences in thermal properties between the two "cloches" or simply reflects differences in their shape and/or volume. Certainly, there was no significant difference in the crust appearance.


The prolonged high heat did discolor the handles of the Calphalon pan. The Copco interior discolored quite a lot. I don't know if this was from the heat or, possibly, from the parchment paper. Anyone who can share experience with this would be appreciated.



The crust is staying crisp as the bread cools. The crumb is well aerated but less open than that of the bâtards I made. It is tender and has a lovely wheaty-sweet flavor with a mild but definite sourdough tang.


I must say I am very favorably impressed with the results of baking this bread in the Dutch ovens. I think the oven spring and bloom are remarkable and much more dramatic than what I have seen with baking on an oven stone covered with a stainless steel bowl. I'll have to try this technique with other breads, but trailrunner's results with the lower hydration Vermont Sourdough certainly suggest my experience will be repeated.


Thanks for the prompt, trailrunner!


David


Submitted to YeastSpotting


 


 

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Chad Robertson's Basic Country Bread from “Tartine Bread” has been a hit among TFL members, and with good reason. It's a wonderful bread, and Robertson's description of how to make it is clear and detailed. He not only describes what to do but also why. He provides variations on his procedures in recognition of the realities of the home baker's scheduling issues and describes their effects on the end product.


Robertson recommended a baking procedure that replicates the result of baking in a commercial gas oven for the home baker. His procedure utilizes a cast iron covered Dutch oven. This particular equipment dictates that the loaves be shaped as boules.


I have made Robertson's Basic Country Bread once before and found it delicious. Its most amazing virtue, to me, is how long it stays moist. I made 2 boules before. However, at the bakery, Robertson shapes this bread as bâtards.


Today, I made the Basic Country Bread as bâtards. They were proofed on a linen couche. The oven was steamed using the SFBI method I've described in another entry(Oven steaming using the SFBI method.). I baked, as prescribed by Robertson, at 450ºF but switched to a dry oven at 15 minutes and baked for a total of 35 minutes.




The crust was very firm initially and sang softly while cooling. It softened with cooling. The crumb was very open – as pictured in “Tartine Bread.” The aroma was very wheaty, and the flavor was very nice, with mild sourdough tang.


This is a bread I'll be making again, no doubt with variations in flour mix and steaming methods. I would like to get a bread whose crust stays crisp longer.


David


 

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I've been thinking about baking a sourdough nut bread for some weeks. They are so nice plain and with cheese. With lots of family expected for several days around Thanksgiving, I'll want a variety of breads I can take out of the freezer to serve with meals and for snacks. I like to serve sourdough nut breads with hors d'oeuvres.


I thought over the breads with nuts I've made before but decided to try something new: a French-style (not too sour) Pain au Levain with hazelnuts and currants.


I based the bread on Hamelman's Pain au Levain from “Bread.” I added about 25% nuts and currants to the dough at the end of mixing and followed Hamelman's procedure for bulk fermentation, proofing and baking.


 


Levain build

Wt.

Baker's %

KAF AP flour

4.6 oz

93.50%

Medium rye flour

0.3 oz

6.50%

Water

3 oz

60.00%

Mature (stiff) starter

1 oz

20.00%

Total

8.9 oz

 

 

Final dough

Wt.

KAF AP flour

1 lb, 9.8 oz

Medium rye flour

1.3 oz

Water

1 lb, 1.8 oz

Salt

0.6 oz

Levain

7.9 oz

Roasted hazelnuts

4 oz

Zante currants

4 oz

Total

3 lb, 13.4 oz

Procedure

  1. Mix the final levain build 12 hours before the final mix. Cover the bowl and let it ferment at room temperature (about 70ºF).

  2. Mix all the ingredients except the salt and levain to a shaggy mass. Cover and let rest (autolyse) for 20-60 minutes.

  3. Sprinkle the salt over the dough and distribute chunks of the levain over the dough. If using a stand mixer, mix with the paddle at Speed 1 for 1-2 minutes to incorporate the added ingredients and then with the dough hook for about 6 minutes at Speed 2. There should be moderate gluten development. Add the hazelnuts and currants and mix for another 2 minutes or so at low speed. Desired dough temperature is 76ºF.

  4. Transfer the dough to a lightly floured board and knead briefly to evenly distribute the nuts and currants. Then round it up and place it in a lightly oiled bowl and cover tightly.

  5. Bulk ferment for 2 ½ hours with two folds at 50 minute intervals.

  6. Divide the dough into two equal pieces and preshape as rounds or logs. Let the pieces rest for 20 minutes.

  7. Shape each piece as a boule or bâtard and place en couche or in a banneton. Cover with plastic or a towel.

  8. Proof the loaves for 2 to 2 ½ hours.

  9. Preheat the oven to 500ºF with a baking stone and steaming apparatus in place 45 to 60 minutes before baking.

  10. When proofed, transfer the loaves to a peel, score them and transfer them to the baking stone.

  11. Turn the oven down to 440ºF and bake with steam for 15 minutes, then in a dry oven for another 25-30 minutes.

  12. Transfer the loaves to a cooling rack, and cool completely before slicing.

     

    Notes on my baking procedure

  • To steam the oven, I use a cast iron skillet filled with lava rocks. This is pre-heated along with the baking stone. Right after the loaves are loaded on the stone, I place a perforated pie pan with 10-12 ice cubes on top of the lava rocks.

  • I start my bake with the oven at conventional setting. At the end of the steaming period, I switch the oven to convection bake and lower the temperature 25ºF.

  • For this bake, when the loaves were fully baked, I turned off the oven and left the loaves on the

    stone with the oven door ajar for 10 minutes.





We tasted the bread when (almost completely) cooled. The crust is very crunchy. The crumb was denser than I had hoped, although this is a rather low-hydration bread. My experience with nutted breads has always been that the crumb tends to be less open than expected, so now I expect it.


The crumb was very chewy. The flavor of the bread was lovely, with no perceptible sourness, except for the sweet-sour flavor of the currents. At this point, the bread, nuts and currents each contributes its distinctive flavor. Quite nice.


I'm looking forward to having this bread toasted for breakfast. 


David


Submitted to YeastSpotting


 

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Traditional baguette, Dragon tail and Épi de Blé (left to right)


These baguettes were made with my San Joaquin Sourdough dough. I shaped a traditional baguette, an épi de blé (sheaf of wheat) and a dragon tail. Each was scaled to 248 g. They were baked with steam for 10 minutes at 460ºF conventional bake and in a dry oven for 10 minutes at 435ºF convection bake. My formula for San Joaquin Sourdough is available here: San Joaquin Sourdough, updated However, for those attempting these shapes for the first time, I recommend using a lower hydration dough such as Pat's (proth5). That formula can be found here: Baguette crumb - 65% hydration dough


Instructions for making an épi



1. Shape a baguette and proof it.


2. Transfer a baguette to your peel.


3. Starting at the left end (if you are right handed) or at the far end, if the baguette is oriented perpendicular to your body, make evenly spaced cuts along the baguette with a sharp scissors. The scissors should cut at about a 45º angle, almost but not completely through the loaf. With each cut, the cut part is rotated away from the long axis of the loaf, alternating right and left.


4. Load the épi onto your baking stone and bake as you would a regular baguette.



Instructions for making a dragon tail baguette



The dragon tail is made in the same way as the épi, except, rather than rotating the cut pieces, the tip of each is folded back over the body, away from the cut surface. Here is a photograph of Miyuki Togi, my SFBI instructor, forming a dragon tail:



SusanFNP has made an instructional video for shaping a Dragon Tail baguette which is highly recommended. Dragon Tail Baguette Shaping Video



Dragon tail, close-up 1



Dragon tail, close-up 2


Enjoy!


David


Submitted to YeastSpotting

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The "San Joaquin Sourdough" is my own recipe. It evolved through multiple iterations from Anis Bouabsa's formula for baguettes. Most of my deviations developed in discussion on TFL with Janedo, who first suggested adding sourdough starter and rye, and, then, leaving out the baker's yeast and making it as a "pure" pain au levain.


I have tried many modifications of ingredients and procedures. The current formula uses the ingredients specified below.


Those who have followed the evolution of this bread will note that I have increased the levain from 20 to 30 (baker's) percent. I have also switched from a 75% hydration levain to a 100% hydration levain, reducing the water added to the dough to keep the overall dough hydration about the same.


Originally, all gluten development was by the “stretch and fold in the bowl” method. I have added a couple folds on the board and lengthened the bulk fermentation prior to cold retarding the dough.


These changes result in a somewhat tangier bread. I don't think they have changed the crust or crumb structure noticeably.


I made two other modifications of my procedures for today's bake: First, I employed the oven steaming method recommended for home bakers by The San Francisco Baking Institute.


The oven is not pre-steamed (before loading the loaves). A cast iron skillet filled with steel pieces (nuts and bolts, rebar pieces) is pre-heated in the oven along with two baking stones. One stone is placed on a rack above the stone and rack on which the loaves will be loaded. When the loaves are loaded, a perforated pie tin filled with ice cubes is set atop the skillet. As the ice melts, water drips through the perforations and turns to steam when it hits the metal pieces.


I deviated from the SFBI-prescribed method in two particulars: I used only a single baking stone, and my cast iron skillet was filled with lava rocks rather than steel pieces.



My second procedure modification was to open the oven door for a few seconds every 5 minutes during the final 15 minutes of the bake. This was to “vent” the steam rising from the loaves themselves in the hope this would result in a crust that stays crisp longer. It did result in less softening of the crust as the bread cooled. Methods to vent the oven and dry the crust during the last part of the bake warrant further exploration.


 


Ingredients

 

Active starter (100% hydration)

150 gms

KAF All Purpose flour

450 gms

BRM Dark Rye flour

50 gms

Water

360 gms

Sea Salt

10 gms

 

Procedures

Mixing In a large bowl, mix the active starter with the water to dissolve it. Add the flours and stir to form a shaggy mass. Cover tightly and let rest (autolyse) for 20-60 minutes.

Sprinkle the salt over the dough. Using a plastic scraper or silicon spatula, stretch and fold the dough 30 times, rotating the bowl 1/5 turn between each stroke. Cover tightly. Repeat this stretch and fold procedure 3 times more at 30 minute intervals.

Fermentation After the last series of stretches and folds, scape the dough into a lightly oiled 2 quart/2 liter container and cover tightly. (I use a 2 quart glass measuring pitcher with a tightly fitting plastic lid manufactured by Anchor Glass.) Ferment at room temperature for 90 minutes with a stretch and fold after 45 minutes, then place in the refrigerator and leave it there for 21 hours.

Dividing and Shaping  Take the dough out of the refrigerator and scrape it gently onto a lightly floured work surface. Gently pat it into a rectangle. Divide as desired or leave in one piece. To pre-shape for a bâtard, fold the near edge up just past the center of the dough and seal the edge by gently pressing the two layers together with the ulnar (little finger) edge of your hand or the heel of your hand, whichever works best for you. Then, bring the far edge of the dough gently just over the sealed edge and seal the new seam as described.

Cover the dough with plastic wrap and/or a kitchen towel and let it rest for about 60 minutes, with the seams facing up. (The time will depend on ambient temperature and how active your starter is. The dough should have risen slightly, but not much.)

To shape a bâtard, fold the near edge of the dough and seal the edge, as before. Now, take the far edge of the dough and bring it towards you all the way to the work surface and seal the seam with the heel of your hand. Rotate the loaf gently toward you 1/4 turn so the last seam you formed is against the work surface and roll the loaf back and forth, with minimal downward pressure, to further seal the seam. Then, with the palms of both hands resting softly on the loaf, roll it back and forth to shape a bâtard. Start with both hands in the middle of the loaf and move them outward as you roll the loaf, slightly increasing the pressure as you move outward, so the bâtard ends up with the middle highest and the ends pointed .

Preheating the oven One hour before baking, place a baking stone on the middle rack and put your steaming apparatus of choice in place. Heat the oven to 500F.

Proofing After shaping the loaf, transfer it to parchment paper liberally dusted with semolina or a linen couche. Cover the loaf with plastic wrap and a kitchen towel or a fold of the linen. Proof until the loaf has expanded to about 1-1/2 times it's original size. (30-45 minutes) Do not over-proof, if you want good oven-spring and bloom!

Baking Pre-steam the oven, if desired.

Slip a peel or cookie sheet under the parchment paper holding the loaf or transfer to a peel, if you used a couche. Score the loaf. (For a bâtard, hold the blade at about a 30 degree angle to the surface of the loaf. Make one swift end-to-end cut, about 1/2 inch deep.)

Transfer the loaf (and parchment paper, if used) to the baking stone. Steam the oven. Turn the oven down to 460F.

After 12-15 minutes, remove the loaf pan and your steaming apparatus from the oven. Rotate the loaf 180 degrees, if it is browning unevenly. Close the oven door.

Bake for another 12-15 minutes, then remove the loaf and place on a cooling rack. Check for doneness. (Nice crust color. Internal temperature of at least 205F. Hollow sound when you thump the bottom of the loaf.) If necessary, return to loaf to the oven to bake longer.

Cooling Cool on a rack for two hours before slicing.

 

David

Submitted to YeastSpotting

 

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When I took the Artisan I workshop at the San Francisco Baking Institute last August, Miyuki demonstrated the method of oven steaming they recommend for home bakers.


The oven is not pre-steamed (before loading the loaves). A cast iron skillet filled with steel pieces (nuts and bolts, rebar pieces) is pre-heated in the oven along with two baking stones. One stone is placed on a rack above the stone and rack on which the loaves will be loaded.


When the loaves are loaded, a perforated pie tin filled with ice cubes is set atop the skillet. As the ice melts, water drips through the perforations and turns to steam when it hits the metal pieces.



I had a hard time finding the perforated pie tins, so I hadn't been able to try this method until today. I did two bakes: One was two loaves of a very familiar bread – Hamelman's “Vermont Sourdough with Increased Whole Grain” from “Bread.” The other was a new bread to me - Chad Robertson's “Basic Country Bread” from “Tartine.” I made two large boules of the Country Bread. One was baked using the “Magic Bowl” technique and the other with the SFBI steaming method, minus the second baking stone and using lava rocks in place of metal pieces.


My current baking method is to pre-heat the oven to 500ºF with the baking stone and skillet in place. When I load my loaves, I turn down the oven to whatever temperature the recipe specifies, using the conventional bake setting. After 10-15 minutes (depending on the total length of the bake), I change the oven setting to convection bake but 25ºF lower. I find, in my oven, conventional baking retains steam well, but convection dries the crust better.


Using the SFBI steaming method, the Vermont Sourdoughs came out substantially similar to how they come out with my previous method – pouring boiling water over the lava rocks. I could not detect any difference in oven spring, bloom, crust color or the texture of either the crust or crumb.



Vermont Sourdough with Increased Whole Grain



Crust Crackles



Vermont SD with Increased Whole Grain crumb


The Basic Country Breads were different from each other. The one baked in under a stainless steel bowl was a bit shinier. The crust softened quicker with cooling. It did not sing when cooling. I don't think there was any real difference in oven spring or bloom.



Basic Country Bread baked with the "Magic Bowl" method



Basic Country Bread baked with the SFBI steaming method



Basic Country Bread crumb


My conclusion is that the SFBI method is effective. It does not require that water be boiled and poured into the hot skillet. To me, it seems a bit easier than the method I've been using. That said, the breads baked using the SFBI method for steaming the oven seem pretty much identical to those I get using my previous technique.


I don't have the kind of covered cast iron skillet/shallow dutch oven that Chad Robertson recommends be used to bake his Basic Country Bread. I do have enameled cast iron ovens that should perform similarly. Perhaps I should try one of them, although my expectation would be that they perform similarly to the "Magic Bowl" method.


David


 


 


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Questions regarding how to convert one kind of starter into another are frequently asked on The Fresh Loaf. The easy answer is to just take "a little bit" of seed starter and add enough flour and water to make a mixture of the desired thickness. This is fine and it generally works very well. However, sometimes a recipe calls for a precise hydration level levain and changing this, even a few percentage points, will make the dough consistency quite different from that intended by the formula's author. For those times, one needs to be more precise in making up the levain. 


To convert a starter of one hydration to a starter of another hydration - For example, if you have a 50% hydration starter and want to build a 100% hydration starter from it. 


 


Here's a general method for a precise conversion:


First, you need to know four things:


1. What is the hydration of your seed starter?


2. What is the hydration of your final starter?


3. How much of the total flour in your final starter comes from your seed starter?


4. How much (weight) final starter will you be making?


Second, you need to calculate the total amount of flour and the total amount of water in your final starter.


Third, you need to calculate the amount of flour and the amount of water in the seed starter.


Fourth, you can now calculate the ingredients of your final starter. They will be:


1. Seed starter


2. Flour (from seed starter plus additional)


3. Water (from seed starter plus additional)


 


So, let's see how this method works with some specific assumptions. 


The four things you need to know:


Assume you have a 50% hydration seed starter that you want to use. Assume you want to make 100 g of a 100% hydration starter. And assume you want the seed starter to provide 25% of the total flour in the final starter.


Note: Using "Baker's Math," Flour is always 100%, and all other ingredients are proportionate to the flour. So, in a 50% hydration mix, the water is 50% (of the flour, by weight). If hydration is 125%, the water is 125% (or 1.25 times) the flour.


To calculate the total amount of flour and water in your final starter:


Flour (100 parts) + Water (100 parts) = 100 g


So, the 100 g of starter is made up of 200 "parts." The weight of each part is calculated by dividing the total weight by the number of parts. So, 100 g /200 parts = 0.50 g.  This number is sometimes called "the conversion factor."


Then, since there are 100 parts of flour, its weight is 100 parts x 0.5 g = 50 g.


The total water in the final dough is 100 parts x 0.5 g = 50 g.


To calculate how much flour will come from the seed starter and how much will be added to make the final starter:


We now know that the total flour in the final starter will be 50 g. But we decided that 25% of this flour is going to come from the seed starter. This means that the seed starter must contain 50 g x 0.25 = 12.5 g of flour, and the flour added to this to make the final starter will be 50 g - 12.5 g = 37.5 g.


To calculate the total weight of the seed starter and the weight of water in the seed starter:


We now need to calculate how much seed starter it takes to provide 12.5 g of flour, and how much water is in this amount of seed starter.


If the seed starter is 50% hydration, it contains 100 parts of flour and 50 parts of water. We know then that the amount of water is 50 parts water/100 parts flour = 0.5  parts of the flour.  Since we already know that the flour has to weigh 12.5 g, then the water must weigh 12.5 x 0.5 = 6.25 g and the total weight of the seed starter is the sum of the water and flour or 12.5 g of flour + 6.25 g of water = 18.75 g.


To calculate the weight of water that must be added to the seed starter to make the final starter:


Now we can calculate how much water must be added to the seed starter to make the final starter. It is the total water in the final starter minus the water in the seed starter or 50 g - 6.25 g = 43.75 g.


 


Now we know "everything!" To make 100 g of 100% hydration starter, beginning with a 50% hydration seed starter, we would mix:


1. 18.75 g Seed Starter.


2. 37.5 g Flour


3. 43. 75 g water


 


This method can be used to build any amount of starter of any hydration using a seed starter of any (known) hydration. 


 


David


 


 

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