Chorizo Onion Soup

1 large yellow onion, chopped
1 pound mini chorizo links or Lil Smokies
2 (14 ounce) cans chopped tomatoes with juice
4 cups fat free chicken broth
1 tablespoon cumin
1/4 teaspoon cayenne pepper
1 (15 ounce) can pinto beans, drained
1 (15 ounce) can refried beans
Chopped cilantro for garnish (optional)

Cut up chorizos or Smokies into small pieces.

In saut