Savoy cabbage clean, wash and cut the leaves from the stalk. Peel, wash and slice the carrots. Peel and chop onions. Heat butter in a pot. Sauté the onion in it until transparent. Add cabbage and carrots. Add stock, bring to the boil and cook for about 20 minutes. Season to taste with salt, pepper and marjoram
Wash and quarter apples, remove core. Cut quarters into thin slices. Add apple slices to the soup for the last 5 minutes. Tear ham into small pieces and add to the soup
Mix sour cream and mustard and serve with the soup. Sprinkle with pepper