Clean and wash the Chinese cabbage and bell peppers and cut into fine strips. Clean, wash and cut spring onions into bite-sized pieces. Cut open the chilli pepper, scrape out the seeds and cut into very fine rings.
Knead the beefsteak mince with the quark, salt, pepper, paprika powder and mustard. Form about 20 small dumplings with wet hands. Heat oil in a pan and fry the meatballs all around.
Add prepared vegetables and chilli pepper. Braise briefly and add stock and some soy sauce and bring to the boil. Braise over medium heat for about 5 minutes. Season to taste with salt and soy sauce.