Finely grate the parmesan. Wash the marjoram, dab dry and pluck the leaves from the stalk. Mix parmesan and marjoram. Cut 4 circles from each slice of toast. Heat the oil in a pan.
Add 8 herbal parmesan puffs to the pan. Place toast thalers on top and fry for 1 minute. Turn the taler and fry for 1 minute more. Remove from the pan and drain on kitchen paper. Peel and wash the carrots and cut them into large pieces.
Peel and finely chop the onion. Heat the fat in a pot and fry the onion until transparent. Add carrots and fry briefly. Add sherry, stock and tomatoes and simmer for 10-15 minutes.
Puree the soup and season to taste with salt, pepper and sugar. Stir the crème fraîche until smooth and add it to the soup as a blob. Draw streaks with a fork. Garnish with Parmesan cheese.