Mix the flours together and then add the sourdough. Then you dissolve the yeast and the salt in the water and mix this with it.
Now you have to knead the dough for 8-10 minutes. Then form a loaf of bread and bake at 250 ° C until the desired brownness is achieved. Bake again, falling to 180 ° C. The bread is ready as soon as it sounds hollow when you tap the underside.