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Still the easiest way to get to sourdough. Make your preferred bread (or in this case bread roll dough) and hold some back.

Mine goes into the fridge in a jam jar. One week later your nose will confirm, sourdough.

I feed once and then incorporate into my dough. When I start shaping one undersized bread roll goes into the jam jar.

Old dough, from last weeks bake, in the jam jar it survived in the fridge in