1. Peel tomatoes using a small, sharp knife. Core and cut into quarters.
2. Soak the bread in water for 2 minutes, then squeeze out the excess moisture.
3. Place tomatoes, moistened bread, cucumbers, pepper, garlic, onion, olive oil, water, 1 tablespoon of the sherry vinegar, and a pinch of salt into a large bowl; mix well. Transfer the vegetable mixture in batches to a food processor or a blender, and purée until almost smooth. Taste for seasoning; add additional sherry vinegar and salt if necessary. Serve with the raw vegetable garnishes in small bowls.
How kids can help: Place the veggie mixture in the unplugged food processor, and push the button to purée; put the garnishes in bowls.