I was wondering if anyone that has purchased Ms Risgaard's book has had a chance to check out her 'Real Rye Bread' recipe. I don't understand why she mixed all of the dough ingredients and then takes out 400 grams of the dough and saves it for the next bake. How long can this be kept? I presume you don't use sourdough then, just the dough amount, in your next bake. I just have never read about this technique except for a simpler formula using only flour, water, sourdough and salt.