Put rice in boiling salted water and let it swell for about 20 minutes. Peel and chop onion. Knead tartar, quark and half of the onion cubes. Season with salt, pepper and paprika.
Form small balls from the chopped mass. Heat the oil in a pot. Fry the meatballs and remaining onion cubes in it and cook for about 5 minutes, remove. Wash and chop the tomatoes. Add peas and stock to the stock and cook.
Season with salt, pepper and paprika. Drain the rice. Add meatballs, rice and chives to the soup. Arrange everything together on a plate.