01 -
Warm the oil in a small pan over low heat for 1-2 minutes. Whisk in the cocoa powder until smooth, adding the warm water only if the paste is too thick to spread. Let it cool.
02 -
In a large bowl, mix the bread flour, whole wheat flour, water, starter, and brown sugar until no dry flour remains. Cover and rest for 30 minutes.
03 -
Sprinkle in the salt and add the cooled cocoa paste. Pinch and fold the dough until the cocoa is evenly mixed and the dough begins to smooth out.
04 -
Cover and bulk ferment at warm room temperature for 3-5 hours. During the first 90 minutes, do 3 sets of stretch and folds, adding the cherries and chocolate during the first fold.
05 -
When the dough is puffy and about 50 percent larger, shape it into a boule. Tuck exposed cherries and chocolate underneath, then place seam side up in a floured banneton.
06 -
Cover the banneton and refrigerate for 8-14 hours. The dough should feel cold, slightly risen, and firm enough to score.
07 -
Preheat a Dutch oven at 450 F (232 C) for 30 minutes. Turn out the loaf onto parchment, score it, and bake covered for 20 minutes. Uncover and bake 20-25 minutes more, until deeply colored and hollow-sounding.
08 -
Move the loaf to a wire rack and cool for at least 2 hours before slicing so the chocolate crumb sets cleanly.