Tuna Spaghetti Salad

8 oz. box spaghetti
(4) 6 oz. cans solid white tuna in water, drained
14?1/2 oz. can petite diced tomatoes, drained
1 small jar pimentos, drained and chopped
1 cup celery, chopped
1 cup pitted black olives, chopped
1 cup sweet onion, chopped
3/4 cup mayonnaise or more as needed
4 tsp. lemon juice

Boil spaghetti in salted water until cooked. Drain. Place in bowl and cut into short pieces. In separate large bowl, flake tuna. Add the rest of ingredients and toss lightly. Mix in spaghetti. Serves 6. Recipe may be doubled.