This classic tuna salad recipe is made using a food processor for quick and easy preparation. The ingredients you will need are: canned tuna, mayonnaise, celery, red onion, lemon juice, Dijon mustard, salt, and pepper. To make the salad, start by draining the canned tuna and adding it to the food processor. Pulse a few times until the tuna is broken up into small flakes. Transfer the tuna to a mixing bowl and add the mayonnaise, finely chopped celery, diced red onion, lemon juice, Dijon mustard, salt, and pepper. Stir everything together until well combined. Taste and adjust the seasoning if needed. Serve the classic tuna salad on bread, in a wrap, or on top of a bed of greens. It's a versatile and delicious recipe that can be enjoyed for lunch or as a light dinner. Enjoy!