It’s easy to see why so many people love tuna sandwiches. All it takes is canned tuna, mayonnaise, and bread to make a basic version at home. It’s also a great meal to grab on the go and a solid lunchtime option at a diner or deli. If you’re going to spend your hard-earned money on a tuna sandwich at a restaurant, though, you want to make sure that you’re getting something that goes above and beyond what you could make at home.