Wash the potatoes and cut into evenly sized slices. Wash savoy cabbage and cut into fine strips. Wash mushrooms, drain and cut into thin slices
Heat 1 tsp. oil. Fry the potatoes in it while turning. Add savoy cabbage and mushrooms and fry briefly. Season with salt and pepper. Add 4-5 tablespoons of water, cover and stew for about 15 minutes
In the meantime, dice the onion. Knead tartar, onion, herbs and quark. Season with salt and pepper and form into a meatball
Heat 1 tsp. oil. Fry the meatball for about 6 minutes on both sides until golden brown. Take out. Dissolve the meat with 2 tablespoons of water and add to the vegetables. Stir the sour cream into the vegetables and serve with the meatball