1/2 avocado
2 tomatoes, diced 3/4"
2 c. cooked shell macaroni
1/4 c. sliced red onion
1 (6 oz.) can water-packed tuna, drained
3 tbsp. bottled vinegar based dressing

Cut avocado half into large 3/4 inch slices. Combine all ingredients and gently toss together.