Knead all ingredients well in a bowl until the dough separates from the bowl.
Add up to 100 ml more water when using pure wholemeal flour or whole meal.
Then shape a ball or a loaf, place it on a greased tray or a sheet lined with baking paper and cover it in a warm place until the volume has roughly doubled. (Depending on the heat, type of flour, and sourdough strength, this can take 2-6 hours.)
Preheat the oven to 200 ° C. Slide in the tray and bake for about 60 minutes.
The bread is ready if it sounds hollow when you tap it (or if no dough sticks to a stick that has been inserted and removed).