Dissolve the yeast in a little water (skimmed off the 1/2 liter). Put the finely ground rye and wheat flour in a mixing bowl and stir all the ingredients together. Let the dough rise for an hour and then knead again.
Put the mixture in a greased loaf pan. Bake in the preheated oven for approx. 1 hour at 200 ° C. Tip: A fireproof bowl with water in the oven helps the dough rise better.