I really like canned tuna fish (although my one occasion of freshly-caught deep sea tuna opened a whole new world for me). I grew up eating tuna fish made with mayonnaise, dill pickles, and boiled egg. Later in life my mother started putting in apples and sweet pickles, which was an absolute desecration of a good dish. Not that I said that, in so many words, to my mother.
Recently I came across a great recipe for grilled tuna-fish sandwiches, along the lines of grilled-cheese. It even froze well (pre-grilled, of course). I'll look for the recipe.
Nowadays, I do half and half mayonnaise and sour cream, and throw in a dash of garlic and celery salt. And dill pickles, of course. If you cut the sandwiches into little triangles and have a picnic on the living room floor, it suddenly become delicious to kids, too.