Clean or peel and wash the soup vegetables. Cut carrots into small pieces, leek into rings. Dice celery finely. Peel and finely dice onions and garlic. Peel, wash and roughly dice the potatoes.
Heat clarified butter in a large pot. Sauté onions and garlic in it. Add soup greens and potatoes and fry. Season with salt, pepper and caraway. Deglaze with 1 l water and stir in broth.
Bring to the boil, cover and cook for 20-25 minutes.
Meanwhile wash the marjoram, shake dry, pluck the leaves from the stalks and chop finely. Remove soup from the stove. Puree only coarsely with a hand blender. Stir in sour cream and marjoram. Bring to the boil again briefly.
Season to taste with salt, pepper and cumin.