Ingredients 1 can tuna, drained 2 tablespoons mayonnaise 1 teaspoon Dijon mustard 1 tablespoon diced celery 1 tablespoon diced red onion Salt and black pepper, to taste 2 slices whole wheat bread Lettuce leaves (optional) Instructions Prepare the Tuna Salad: In a bowl, combine the drained tuna with mayonnaise, Dijon mustard, celery, and red onion. […]