00:00You have to feed this jar every day. It's called a sourdough starter, and it's made with flour and
00:04water left out until wild yeast from the air moves in and starts living inside it. And although it
00:08looks like a lump of paste, the yeast is constantly eating the flour and releasing gas, which is what
00:13makes the whole jar bubble and grow on its own. And after about a week of feeding, it gets strong
00:17enough to raise a whole loaf of bread.
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