An infusion of basil lends this creamy tomato soup an irresistible Proven al perfume.
Balsamic vinegar brings the flavors into focus.
Sweet vine-ripened tomatoes are the key to flavor in this creamy soup. Yields about 8 cups. In a large soup pot, heat the olive oil over medium-high heat. Add the onions and cook, stirring occasionally, until softened, about 7 min. Tie the basil sprigs together with a piece of kitchen twine.