Clean, wash and cut the savoy cabbage and celery into strips or slices. Press the sausage meat out of the skin, form it into small balls and fry them all around in a pot in hot oil. Take out and put aside. Sauté cabbage and celery in frying fat. Pour on 1 litre of water. Stir in stock and tomato paste.
Season with salt and pepper and cook for 20-25 minutes. Drain beans, rinse cold and drain. Clean, wash and chop the tomatoes. Add the beans, tomatoes and meatballs to the stew 5 minutes before the end of the cooking time and cook with them. Mix sour cream and pesto. Serve with the stew