Mahi Mahi with whites

2 tablespoons olive oil 3 small onions, chopped 4 cloves garlic, minced 5 button mushrooms, sliced 1 1/2 pounds mahi mahi salt and pepper to taste 1/4 cup[...]

4 (6 ounce) mahi mahi steaks 2 teaspoons salt 2 teaspoons lime juice 1/8 teaspoon ground black pepper 12 ounces diced tomatoes 2 small yellow onions , sliced[...]