Black Bean and Citrus Salad

From the Moosewood Cookbook, this one is an absolute winner. I have made this numerous times, sometimes omitting the onion and corn. A am in love with the dressing, but I substitute olive oil for the vegetable oil. Must tell you: The cumin tastes incredible when combined with the oranges and grapefruit. This is a great spring or summer get-together salad. What's a get-together? Well, it's when we all "get together" to EAT!!!

3c black beans
1c corn kernels
1 tomato, cubed
1/2c red onion, chopped
1 red bell pepper, diced
2 oranges, peeled & cut into small pieces
1 grapefruit, peeled & cut into small pieces                    1-2 avocados, diced
1/2c chopped cilantro

dressing:
1/4c lime juice
2tbsp lemon juice
2 garlic cloves, minced
3 tbsp veg. oil
1 tbsp ground cumin
1/2 tsp salt