4 cups diced peeled avocados (about 4 medium) |
3 1/4 cups chilled buttermilk |
5 tablespoons fresh lime juice |
1/4 cup chopped green onions |
1/4 cup chopped fresh cilantro |
1 teaspoon minced seeded serrano chile |
1 teaspoon chili powder |
6 tablespoons chopped fresh mint leaves, divided |
3 cups (or more) low-salt chicken broth |
1 cup diced seeded tomatoes( garnish ) |