Process all ingredients into a firm dough. Mix in the seeds to taste. Let rest for 30 minutes. Knead vigorously once and let rest for another 30 minutes. Knead firmly, form a roll and cut into 10 equal pieces. Shape biscuits, brush with lukewarm water, place grains on top, place on a baking sheet lined with baking paper and leave to rest for another 30 minutes. Bake at 220 degrees for 20-30 minutes.
Tip:
Sprinkled with coarse salt and a little caraway seeds, they also taste good.