Cut the tomatoes, onion, and bell pepper(s) into small chunks. Process vegetables separately in a food processor, pulsing each until finely chopped or smooth, as desired. Combine vegetables, garlic, cilantro, parsley, chili, salt, oil, vinegar, and bread in food processor, and pulse until you obtain the texture you prefer. Substitute balsamic or other vinegar for the sherry vinegar, if you wish, or use half sherry vinegar, half other vinegar. Sherry vinegar has a distinctive taste that suits the combination of vegetables and herbs.