Tuna sandwich

A tuna fish sandwich, a tuna salad sandwich, or tuna sandwich, is a type of sandwich usually made with tuna salad and includes ingredients such as mayonnaise and celery. Other common variations include the tuna boat and tuna melt.
The sandwich has been called "the mainstay of almost everyone's American childhood", and "the staple of the snatched office lunch for a generation." In the United States, 52% of canned tuna is used for sandwiches.