- In a large saucepan, melt the butter. Add the onion and cook over moderate heat, stirring, until softened, about 5 minutes. Add the tomatoes and their juices, along with the tomato paste and cook, stirring, for 5 minutes. Add the broth and basil and season with salt and pepper. Simmer until the tomatoes are broken down, about 15 minutes. Discard the basil and puree the soup until smooth.
- Preheat the broiler and arrange the baguette toasts on a baking sheet. Sprinkle with the cheese and broil just until melted, about 30 seconds. Serve the soup with the cheese toasts.
Make Ahead: The soup can be refrigerated overnight.
Recipe Credit: Grace Parisi
Image Credit: Con Poulous
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