Mix the first four ingredients thoroughly on the evening before the baking day. Cover the bowl with foil and let it stand overnight at room temperature (remove 50 g the next morning)
Now add all the other ingredients to the pre-dough and knead everything for 10 minutes. Let the dough rest for 30 minutes, then knead it, then let it rest for another 30 minutes. Knead again, then place in 2 to 3 proofing baskets and cover again for 30 minutes.
Preheat the oven to 230 ° C top / bottom heat. Overturn or cut the bread on a baking tray or baking stone. Then spray in water and bake for about 50 minutes.