Anyone who has seen my blog knows I make naturally leavened panettone often. I have tried a new recipe by Massimo Vitali which includes cocoa butter. The recipe also calls for milk powder which I don't keep, so I left it out. I made a few other adjustments with water and flavourings but other than that it's as described in the formula.

Finished dough.
 

Baked. The dough surface was very tight and ruptured in the oven. More water next time!
 

Crumb.
 

Formula.