This will be your new go-to recipe for tuna salad!
In a medium bowl, combine tuna, mayonnaise, shallot, pickle, lemon juice, and garlic. Add salt and pepper to taste. (You could also add a little celery salt for added flavor.)
Lay a piece of bread on your plate (or slice a croissant) and top with lettuce, tuna mixture, and then a slice of tomato.