Cut the white bread into small cubes. Sweat the onion in the butter and pour over the bread.
Cut the cooked beetroot into small pieces, puree with the eggs in a blender and add to the bread with the grated cheese. Add the flour, season with salt and parsley. Mix all ingredients well and let the mixture steep for 15 minutes.
Shape the mixture into dumplings that are not too large and simmer in salted water for about 15 minutes. The finished dumplings are drizzled with melted butter and sprinkled with parmesan before serving. Serve as a side dish with green salad.