Preheat the oven to 160 ° C. Mix all ingredients together. Let it soak for 10 minutes. Shape the mixture into 5 balls. Press it flat and press a hole in the middle with your finger. It could be that the outside tears a bit, simply smooth it out again with a slightly moistened finger. If you like, you can now slightly moisten the bun rings and sprinkle with seeds. Bake for about 30 minutes. When they are through, they sound hollow when you knock on the floor.