Dissolve the yeast in lukewarm water and add a pinch of sugar.
Grind the spelled, add salt and add grains of your choice. Add the yeast water and knead for approx. 5 minutes to form a smooth dough. Put the dough in a plastic bowl and cover with a tea towel. Then let the dough rise in a warm place (e.g. in an open oven at 50 ° C) until it is twice as high (takes about 15-20 minutes).
Then knead the dough again briefly. Now shape the dough into a loaf of bread (it is best to put some flour on your hands, otherwise the dough will stick too much) and place on a baking sheet lined with baking paper. Brush the loaf of bread with the egg white and let rise for another 15 minutes.
Bake in the preheated oven at 200 ° C for about 42-45 minutes on the middle rack.