Update 2022: If you want my current tuna salad recipe, head on over to the egg salad node. It's there along with my criticisms of this node, left here for historical purposes.
Being the southern food connoisseur that I am, I have developed a wonderful recipe. It should only be attempted if followed to the letter (brand names and all!)
Mix tuna, mayo, mustard, hot sauce, garlic, and pickle juice in a bowl. Fold in onion, egg, pickle cubes, and celery. Add crushed saltines to achieve the desired consistency.
The only variance that I suggest from the recipe is the hot sauce. Never use less than the suggested amount, but feel free to pile it on if that's your thing (like mine).