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Sourdough is a dough containing a Lactobacillus culture in symbiotic combination with yeasts. It is one of the principal means of biological leavening in bread baking, the others using cultivated forms of yeast.It is important in baking rye-based breads, where yeast does not produce comparable results.read made from 100 percent rye flour, which is very popular in the northern half of Europe, is usually leavened with sourdough. Baker's yeast is not useful as a leavening agent for rye bread, as rye does not contain enough gluten.
Sourdough starter begins with a combination of flour and liquid. The proportion and type of flour and liquid can vary dramatically, from a stiff starter made entirely with rye flour and water, to a liquid batter of milk and cornmeal, and everything in between.aking with sourdough. The simplest beginnings â flour and water â can lead to magic. The simplest definition of sourdough comes from the dictionary: leaven, especially fermented dough retained from one baking and used, rather than fresh yeast, to start the next.