This Tuscan soup is a good way to use a bumper crop of tomatoes and basil, as well as any leftover bread. The bread soaks up the flavorful liquid as it cooks, becoming soft and lending body.
Cook oil, leeks, onion, and garlic in a large stockpot over medium heat, stirring, until vegetables turn golden, about 7 minutes. Raise heat to medium-high. Add wine; cook until reduced to 1/4 cup, about 10 minutes.
Add tomatoes, half the basil, and the water. Bring to a gentle simmer and cook 15 minutes. Add bread; cook, stirring occasionally, 20 minutes. Season with salt and pepper; cook 10 minutes more. Add remaining basil; cook 10 minutes. Add more water, if necessary, to achieve desired consistency. Serve drizzled with oil and sprinkled with cheese.