The soup of tomatoes and Basil (cold soup)

Ingredients for 4/6 persons:
1 kg. by ben ripe tomatoes
1 small red onion of Tropea
1 stem of celery
3 cloves of garlic
2 Bay leaves
1 sprig of fresh thyme
1chiodo clove
10 12 fresh basil leaves
2 Tablespoons extra-virgin olive oil
Sour cream to taste
Sea salt to taste
Grinding black pepper

   First press in the onion the clove and put it in a pot with tomatoes well washed, chopped and crushed garlic, chopped celery, well, olive oil, the sprig of thyme, Bay leaves, salt and water 50 cl.
Cover with a lid and cook on high flame until it all comes to a boil.
At this point you can remove the lid and lower the flame and simmer over low heat for about 20 minutes.Switch off, remove the onion, thyme and Bay leaves and let cool in a soup tureen.
   Wash the Basil and spezzettatelo, wipe it with your hands (if the cut with the knife becomes black, some bit of irregular leaf Basil strips not black!), then add the sour cream to your liking.
Once cooled the soup, join the Basil.

Serve cold soup by adding some toast and olive oil.