Black Bean Salsa

I've never made my own salsa, but I went out on a limb to try this one and it turned out great. Our whole family loved it!

1 (15-oz) can black beans, drained & rinsed
8 oz frozen corn
1/4 cup chopped fresh cilantro
2 tablespoons chopped green onions
2 tablespoons chopped white or yellow onions
1/4 cup lemon juice
2 tablespoons vegetable oil
1 1/2 teaspoons ground cumin
salt and pepper to taste
1/2 cup chopped tomatoes

In large bowl, combine beans, corn, cilantro, green onions, yellow onions, lemon juice, oil and cumin. Season with salt and pepper to taste. Cover and chill at least 2 hours or overnight. Just before serving stir in tomatoes.