Ingredients
- 3 tablespoons unsalted butter
- 3/4 cup minced sweet onion, such as Vidalia
- 1 1/2 pounds tomatoes—peeled, seeded and chopped, with juices
- 1 teaspoon tomato paste
- 2 cups low-sodium chicken broth
- 1 basil sprig
- Salt
- Freshly ground pepper
- 12 thin baguette slices, toasted
- 1/4 cup plus 2 tablespoons freshly grated Parmigiano-Reggiano cheese
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