A tuna sandwich, a tuna salad sandwich, or a tuna fish sandwich, is a popular type of sandwich. It is usually made with canned tuna mixed with mayonnaise and celery. Some preparations might use olive oil instead of mayonnaise. Other common variations include the tuna boat and tuna melt. The tuna sandwich has been called “the mainstay of almost everyone’s childhood” and “the staple of the snatched office lunch for a generation.” In the United States, 52% of canned tuna is used for sandwiches.