Remove the crusts from the toast and dice finely. Put 1 tomato aside. Wash the remaining tomatoes, carve them crosswise and blanch them in boiling water. Quench cold, peel skin. Cut tomatoes into quarters and remove seeds.
Clean and wash the peppers, cut them into small cubes. Peel and chop garlic. Puree toast, seeded tomatoes, red pepper cubes, garlic and olive oil. Season to taste with salt, pepper and vinegar. Chill for at least 1 hour. Wash, clean, quarter and seed the remaining tomatoes. Cut the flesh into small cubes. Wash and finely dice the cucumber as well. Flavour soup again.
Chill for at least 1 hour. Wash, clean, quarter and seed the remaining tomatoes. Cut the flesh into small cubes. Wash and finely dice the cucumber as well. Flavour soup again. Serve sprinkled with diced vegetables and basil