Black Bean Soup - great as a main course or as a side with tacos

2 (15 ounce) cans black beans, drained
1 1/2 cups vegetable stock or chicken stock
1 cup salsa
1 teaspoon cumin
4 tablespoons sour cream
2 tablespoons green onion

In an food processor, combine beans, broth, salsa, and cumin. Blend until fairly smooth. Heat the bean mixture in a saucepan over medium heat until thoroughly heated. Ladle soup into 4 individual bowls, and top each bowl with 1 tablespoon of the sour cream and 1/2 tablespoon green onion. Takes no time at all!