Home | Picturehouse Cinemas. Basic Sourdough Starter Recipe. In addition to flour, water, and yeast, your starter also contains bacteria. When these bacteria feed on the sugars in flour, they produce acidic by-products. This is what gives sourdough its sour taste. Actually, all doughs contain at least some bacteria. So why aren’t all breads sour? In doughs made with bakers’ yeast (the kind you buy in the store), the yeast outnumber the bacteria. Sourdoughs and other raised breads also differ from one another because of the eating habits of the yeasts that make them rise.
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