Many comfort foods that are now considered nostalgic fare used to be ubiquitous at diners. We'd love to bring back some, but others should stay in the past.

Firehouse Subs Tuna Salad sandwich is made with tuna, relish, mayo, and black pepper, with provolone, lettuce, tomato, onion, mayo, and deli mustard, and a solid choice for a decent tuna option.. “If ...