Boil a large pot of salted water. Cook elbow macaroni, stirring occasionally, until tender yet firm, roughly 8 mins. Drain well, then chill in the fridge.
Combine 1 cup mayonnaise, tuna, celery, and onion in a bowl. Mix in macaroni, remaining mayonnaise, tomatoes, and olives. Season with salt and pepper.
Refrigerate for 1 hour to let flavors meld.
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