After mixing the flour, salt, and levain into a dough, you put it all into a bowl or container, cover it, and let it rest.
The dough’s first rise is called bulk fermentation. After mixing the flour, salt, and levain into a dough, you put it all into a bowl or container, cover it, and let it rest. The dough will undergo a fermentation process during this critical step. Bacteria and yeast begin to generate organic acids and alcohols and leaven the dough, which will translate to flavor and rise in your final bread.