Tuna Salad Sandwich Recipe

Prepare tuna

Open and drain the canned tuna well. Place the drained tuna in a medium mixing bowl and use a fork to flake it into bite-sized pieces, breaking up any large chunks.

Combine wet ingredients

Add the mayonnaise (6 tbs) and Dijon mustard (1 tsp) to the flaked tuna. Stir until the mixture is creamy and mostly homogenous.

Add vegetables and seasonings

Fold in the finely diced celery (1/2 cup), minced red onion (2 tbs), and sweet pickle relish (1 tbs). Add the lemon juice (1 tbs) and chopped parsley (2 tbs). Season with 1/2 tsp salt, 1/4 tsp freshly ground black pepper, and optional 1/4 tsp celery salt if using. Taste and adjust seasoning — add more lemon for brightness, more mayo for creaminess, or more salt/pepper as needed.

Chill (optional)

For best flavor meld, cover the bowl and chill the tuna salad for 15–30 minutes in the refrigerator. If short on time, you can assemble immediately.

Prepare bread

Lightly spread butter or a thin layer of mayonnaise (about 1/2 tbs per slice) on one side of each bread slice. This prevents sogginess and adds flavor.

Assemble sandwiches

Place 1 lettuce leaf on four of the bread slices (buttered/mayo side down). Divide the tuna salad evenly into four portions (about 3 oz tuna mixture per sandwich). Mound one portion of tuna salad onto each lettuce-lined slice. Top each with 2 tomato slices and 2 pickle slices if using.

Finish and serve

Top with the remaining bread slices, buttered/mayo side up. Press gently, then cut each sandwich diagonally or in half if desired. Serve immediately, or wrap and refrigerate up to 24 hours for later.

Storage

Store leftover tuna salad in an airtight container in the refrigerator for up to 3 days. Assembled sandwiches are best eaten within a few hours to avoid soggy bread.