Clean, wash and cut the soup greens into small cubes. Peel and finely dice the onion. Heat oil in a pot. Fry the onion and half of the soup vegetables in it. Dust with flour and sauté briefly.
Add tomatoes except for 2-3 tomatoes. Add stock, bring to the boil and cook for about 10 minutes. Cook the rest of the soup vegetables for about 10 minutes in boiling salted water and pour onto a sieve. Cut remaining tomatoes into small pieces.
Puree the tomato soup. Season to taste with salt and pepper. Add remaining soup vegetables and tomato pieces. Serve tomato soup with crème fraiche. Sprinkle with pepper. Serve with baguette.