Dissolve the yeast in lukewarm water. Add whole spelled flour, whole wheat flour, flax seeds, sesame seeds, sunflower seeds, vinegar and salt and stir everything well. Pour the dough into a loaf pan (approx. 30 cm) lined with baking paper and place on the middle rail of the cold oven.
After 15 minutes, heat the oven to 200 ° C top / bottom heat (gas: level 3, convection 180 ° C) and bake the bread for about 1 hour.