Combine all ingredients with one serving of dressing in a large mixing bowl.
VARIATIONS & OPTIONS
This is a neutral salad, so if you want more flavor, add in fresh herbs like Italian parsley, cilantro, rosemary and basil. For a great warm entree, saute the tuna, beans and onions in a large non-stick frying pan. Then combine with the avocado and garnish with salad dressing.