Crumble the yeast and dissolve in 750 ml of lukewarm water while stirring. Put salt, both types of flour and sugar in a large bowl. Add yeast water and knead everything into a smooth dough. This is best done with a food processor or by hand.
Finally, knead in the grains and seeds. Cover the bowl with a damp tea towel. Let the dough rise in a warm place for about 1 hour until it has doubled in volume.
Line a baking tray (approx. 32 x 39 cm) with baking paper. Halve the dough and knead briefly on a floured work surface. Form one piece of dough into a round loaf, the other piece into an oblong loaf.
Place the loafs on the baking tray, cut them into pieces, cover and leave to rise for another 20 minutes. Brush with water and dust with flour. Bake in a preheated oven (electric cooker: 225 °C/ circulating air: 200 °C/ gas: see
manufacturer) Bake for 10 minutes. Reduce temperature (electric oven: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) and bake for another 35-40 minutes. Remove from oven and let cool on a cake rack.