Tex-Mex Taco Salad

1/2 head lettuce
1 can black beans
1/2 cup chopped onion
1 cup shredded mexican 4 cheese
1 tomato, chopped

Mix 1/3 cup mayo, 1/3 cup sour cream, and 1 T taco seasoning. Spread over salad.
Top with avocado and 1/4 cup cilantro.