Mix the dry ingredients in a large mixing bowl. Dissolve the yeast in lukewarm water and pour into the mixing bowl in one go. Knead the dough in the food processor for 5 minutes, then cover and let rise for about 50 minutes. The dough must be visibly bigger.
Flour a proofing basket. Knead the dough briefly again on the worktop, then place in the proofing basket and cover.
Preheat the oven to 250 degrees top / bottom heat. As soon as the oven is hot, tip the bread dough onto a tray and slide it into the hot oven on the lower rail. Pour a cup of water on the bottom of the stove - be careful, hot steam! - and close the oven door immediately. Bake for 15 minutes at 250 degrees, then turn down to 200 degrees and bake for another 45 minutes.
Let cool on a wire rack. I always freeze the bread in portions.