Supermarket sourdough is often sourfaux – here's how to make the real thing

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Supermarket sourdough is often sourfaux – here's how to make the real thing  The Guardian Full coverage

https://www.theguardian.com/food/shortcuts/2018/oct/02/supermarket-sourdough-is-often-sourfaux-heres-how-to-make-the-real-thing