Soak rolls in cold water. Peel and finely chop the onion. Mix minced meat, 1 egg, onion and squeezed out roll. Season with salt and pepper. Form 6-8 flat meatballs.
Separate remaining egg. Peel and coarsely grate the potatoes. Mix with egg white and mustard, season with salt. Turn the meatballs in egg yolk. Press the potato mixture firmly all around. Fry in hot oil at low heat for 8-10 minutes on each side. Meanwhile clean and wash the leek and cut it into bite-sized pieces. Peel, wash and slice the carrots. Cook in 400 ml boiling water for about 10 minutes. Add cream.
Meanwhile clean and wash the leek and cut it into bite-sized pieces. Peel, wash and slice the carrots. Cook in 400 ml boiling water for about 10 minutes. Add cream. Stir in fixed powder, simmer again for another 5 minutes. Season to taste with salt, pepper and nutmeg. Serve sprinkled with parsley and garnished