I grew up eating tuna salad made with sour pickles, onions, and mayonnaise. When I married, my m-in-law made a delicious tuna salad with apples as one of the main ingredients. I LOVED it and began to use that recipe. My husband likes pecans (Texas' state nut) in everything, so I always add a handful, but they are optional. It's better to begin with the chopped apple so you can sprinkle lemon juice over the pieces to keep them from turning brown. I also prefer unpeeled apples. I am saying this makes 6 servings because we like THIN sandwiches. I also sometimes make my sandwich ingredients the night before because allowing to set a while makes the flavors blend.