Roasted Tomato-Basil Soup

Preheat broiler. Coat a baking sheet with cooking spray.

Place tomatoes on the prepared baking sheet, cut-side down. Broil until skins are blistered, about 10 minutes. Set aside to cool. Slip off the skins and chop the tomatoes coarsely.

Meanwhile, heat oil in a medium saucepan over medium-low heat. Add onions and cook, stirring often, for 5 minutes. Add garlic and cook, stirring, until the onions are very soft, about 5 minutes longer. Stir in tomatoes and cook, stirring, for 1 minute.

Transfer the mixture to a food processor or blender and process until smooth; return to the saucepan. Stir in broth and bring to a boil. Reduce heat to low and simmer for 5 minutes. Remove from the heat and stir in basil. Season with salt and pepper. Cover loosely and refrigerate until chilled, 2 1/2 to 3 hours.