A delightful twist on the classic tuna salad sandwich, featuring a zesty and flavorful filling.
Combine the tuna, chopped egg, onion, and celery in a mixing bowl.
Ensure the tuna is well-drained to avoid a watery salad.
Add mayonnaise, mustard, salt, and pepper to the bowl and mix well.
Adjust the seasoning to your taste preference.
Spread the tuna salad evenly on two slices of bread.
Use a butter knife for an even spread.
Top with tomato slices and lettuce leaves.
Arrange the toppings neatly for a visually appealing sandwich.
Place the remaining bread slices on top and serve.
Cut the sandwich diagonally for a classic presentation.