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In a bowl mix together 450 g strong white flour, 300 g water (tepid), and 150 g rye sourdough starter. Allow it to rest and hydrate for 30 minutes.
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Add 10 g fine sea salt. Knead the dough for 5-10 minutes until it’s stretchy and elastic.
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Put the dough back in the bowl, cover it, and leave it to prove for around 4 hours until it’s twice the size.
Once or twice while proving you may stretch and fold the dough inside the bowl to increase its strength.
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Transfer the dough to an unfloured surface and shape it into a ball. Leave to rest for 20-30 minutes.
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Work the dough to your desired shape and place the loaf in a floured proving basket.
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Rest the dough for 2-3 hours more.
If you wish, you can place the dough in the refrigerator after a couple of hours to extend proving for up to half a day.
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Preheat your oven to 230°C.
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Turn the dough onto a semolina-dusted tray and score.
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Carefully transfer the loaf into a coccote or Dutch oven. Place it in the oven and bake with the lid on for 20 minutes.
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Remove the lid and bake for up to 30 minutes more.
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Allow the loaf to cool down slightly before serving.