This is a simple recipe that can double as a sauce for pasta. Tomatoes are chock full of the antioxidant lycopene, which has been shown to decrease the risk of cancer and cardiovascular disease, among others. Use salt-free canned tomatoes if you can find them. I sometimes substitute fresh rosemary for the basil, and it's delicious. If you like, sprinkle the soup with some grated Parmesan or pecorino cheese.