Sourdough Starter Day by Day Photos
If You're Making a Sourdough Starter For the First Time, Here's a Daily Guide in Pictures
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In the afternoon of day 15, the sourdough starter had more than doubled in size and was active enough to use for focaccia. I also tested it out by dropping a piece of it into a cup of water to see if it would float (it did!). This is how you can test if your sourdough starter is mature enough to use in a recipe.
(In case you were wondering, the focaccia was a complete and utter disaster unrelated to my trusty sourdough starter. But I'm not giving up.)