Cookbook talk:San Francisco Sourdough Bread
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If I remember correctly, the San Francisco sourdough yeast came from local berries. So the entry might be expanded to mention that other edible berries can work as well as grapes. The white powder on the outside of many thin-skinned fruits and berries is wild yeast.
- As far as I know, san francisco starters don't use grapes. The yeast and etc necessary for the distinictive sourdough flavor are floating around in the air.
What kind of covered container should you use for the starter? If you use a tight lid wouldn't there be problems with gas exchange, wouldn't the yeast loose effectiveness from lack of oxygen? If you use a cloth or some kind of breathable cover would it become infected?