Tomatoes, onions and garlic develop a deep, rich flavor when roasted. A mix of different colored cherry tomatoes will add a playful note. This soup is adapted from a recipe in Amy Goldman’s book The Heirloom Tomato: From Garden to Table (Bloomsbury USA, 2008).
- Preheat oven to 450°F.
- Toss onions, oil, salt and pepper in a 9-by-13-inch pan. Roast the onions, stirring once or twice, until starting to brown, about 20 minutes.
- Stir in tomatoes and 1/2 cup garlic and continue roasting, stirring once, until the tomatoes are falling apart and beginning to brown in spots, about 20 minutes more.
- Transfer the onion-tomato mixture to a large saucepan. Add broth. Bring to a simmer over medium-high heat. Remove from the heat and cover to keep warm.
- Meanwhile, place bread on a large baking sheet and bake until toasted, about 10 minutes. Rub both sides of the toasted bread with the halved garlic clove. (Discard remaining garlic.)
- To serve, place a piece of toasted bread in a shallow soup bowl. Ladle about 1 cup soup over the bread. Sprinkle with basil and cheese and serve immediately.