Prepare the sourdough the evening before by mixing the specified ingredients together. Cover the sourdough and let it rest overnight.
On the baking day, remove 50 g of the sourdough as a topping for the next baking day and use the rest for the bread by kneading the sourdough with the ingredients for the main dough until a homogeneous dough is formed. Let the dough rest briefly. Then knead the dough using the stretch and fold method and form a loaf.
Cover the loaf in the floured proving basket and let rise for 2 - 3 hours.
Preheat the oven to 250 ° C.
Turn the bread out and cut into it. Bake the loaf for 10 minutes, then switch it down to 200 ° C and finish baking the bread in about 50 minutes. The tapping or core temperature test reveals whether the bread is ready.