2 1/2 teaspoons olive oil |
1 cup chopped onion |
1/2 cup chopped carrot |
6 cups chopped seeded peeled tomato (about 3 1/2 pounds) |
1/4 teaspoon black pepper |
1 (14 1/2-ounce) can vegetable broth |
6 tablespoons plain fat-free yogurt |
1 tablespoon minced fresh tarragon |