Clean or peel and wash the soup vegetables. Quarter carrots lengthwise and cut into pieces. Cut leek into rings. Dice celery finely. Peel and chop onions and garlic. Peel, wash and chop the potatoes
Heat clarified butter in a pot, fry onions and garlic in it. Add soup vegetables and potatoes and fry while turning. Season with salt, pepper and caraway seeds, add vegetable stock. Bring to the boil, cover and cook for 20-25 minutes
Meanwhile wash the marjoram, shake dry, pluck the leaves roughly from the stalks and chop finely, except for a little to garnish. Remove the soup from the stove, puree coarsely. Stir in sour cream and marjoram. Bring to the boil briefly, season to taste with salt, pepper and caraway seeds. Arrange in deep plates garnished with marjoram