Classic Diner-Style Tuna Salad Sandwich

1.Prepare the tuna: Open the cans of tuna and drain them thoroughly. Place the tuna in a medium mixing bowl.

2.Combine wet ingredients: Add the mayonnaise, lemon juice, and Dijon mustard to the bowl with the tuna.

3.Add aromatics and seasoning: Stir in the finely chopped celery, red onion (if using), kosher salt, black pepper, and paprika.

4.Mix thoroughly: Gently fold all ingredients together using a fork or spatula until just combined. Do not overmix; a slightly flaky texture is desired.

5.Taste and adjust: Taste the tuna salad and adjust seasoning if necessary (add more salt, pepper, or lemon juice for brightness).

6.Prepare the bread (Optional Toasting): If desired, lightly butter one side of each slice of bread. Toast the bread in a skillet over medium heat or in a toaster until lightly golden brown and crisp.

7.Assemble the sandwiches: Lay out four slices of bread. Divide the tuna salad mixture evenly among these four slices, spreading it to the edges.

8.Add lettuce and top: Place one or two crisp lettuce leaves over the tuna salad on each sandwich base. Top with the remaining four slices of bread.

9.Serve: Slice the sandwiches in half diagonally and serve immediately, perhaps alongside potato chips or pickles.