For the spelt-rye bread, mix water, buttermilk and yeast until the yeast has dissolved, add all the other ingredients and knead for about 8 minutes to a smooth dough (preferably with a food processor).
Place in a warm place, cover and let rise to double height. Knead again, form into a roll, flour well, let rise well in a bread basket.
Preheat oven to 220 °C, place a cup of water on the bottom of the oven. Turn the dough out onto a tray, place in the oven and bake for 35 minutes. Leave to cool on a rack.