tuna sandwich recipe

1 can (5 oz) tuna, drained - 2 tablespoons mayonnaise - 1 tablespoon finely chopped celery - 1 tablespoon finely chopped red onion - 1 teaspoon lemon juice - Salt and black pepper to taste - 2 slices of bread (whole wheat, white, or your favorite type) - Lettuce leaves (optional) - Sliced tomato (optional) - Pickles (optional)