Prepare Your Starter: Ensure your sourdough starter is active by feeding it 6 to 8 hours before starting the recipe.
Mix Wet Ingredients: In a bowl, combine water, sourdough starter, honey, molasses, and oil.
Add Dry Ingredients: Add whole wheat flour, all-purpose flour, cocoa powder, and salt. Mix until a dough forms.
Knead: Knead for about 8 minutes with a stand mixer or 15-20 minutes by hand. The dough is sticky at first, so wet or flour your hands if needed. After kneading, the dough should pass the windowpane test (stretch without tearing).
Bulk Fermentation: Transfer the dough to a clean bowl, cover, and let rise for 6-8 hours, or until it has risen by at least 75%.
Cold Ferment (Optional): After bulk fermentation, you can cold ferment the dough for up to 48 hours or proceed to shaping and baking.
Shape the Dough: Divide the dough into 4 equal parts. Let them rest for 10 minutes before shaping. Flatten each piece into a rectangle, then roll into a log, pinching the ends to seal.
Second Rise: Place rolls on a parchment-lined baking sheet dusted with cornmeal. Dust the tops with cornmeal, cover, and let rise for 1-1.5 hours until puffy.
Bake: Preheat the oven to 350°F. Bake the rolls for 25-30 minutes. Let them cool for at least 30 minutes before serving.