Scald tomatoes, skin them. Remove the stalk base. Cut tomatoes in half. Clean carrots and cut them into large pieces. Peel onion and chop finely. Heat the fat in a pot and fry the diced onion until transparent.
Add vegetable stock. Add carrots and tomatoes and cook for 15-20 minutes. In the meantime, whip 100 g cream until stiff. Wash the chives and cut into fine rolls. Puree the vegetables in the stock. Refine with remaining cream and season with salt and pepper.
Arrange in soup bowls and serve with whipped cream and chives.