Dissolve yeast in 700 ml of lukewarm water. Mix flour and salt in a large bowl (with lid). Stir the yeast water briefly into the flour with a wooden spoon. Close the bowl with the lid and let it rest for about 18 hours at room temperature
Dust 1 piece of baking paper generously with flour. Using a dough scraper, remove the yeast dough from the bowl and place it on the baking parchment. Using the baking paper, roll the dough over from 4 sides to the middle until the dough is bread-shaped. put the dough on the baking paper back into the bowl, close it and let it rise again for about 1 hour
Preheat oven (electric cooker: 225 °C/ circulating air: 200 °C/ gas: see manufacturer). Line a roaster (4.5 litres capacity) with baking paper. To prevent the paper from wrinkling, place a circle on the bottom and a wide strip at the edge so that the roaster is completely covered. Place the roaster with lid in the oven until it has reached operating temperature
Lift the dough out of the bowl on the baking paper. Dust hands thickly with flour, lift dough from baking parchment and carefully place in the roaster (attention: hot!). Put the lid on top. Bake in the oven for about 30 minutes. Remove lid. Reduce oven temperature (electric oven: 200 °C/ circulating air: 175 °C/ gas: see manufacturer) and bake the bread for another 30 minutes. Remove bread from the oven, wrap in a tea towel and let it cool down
waiting time approx. 19 hours