Tuna Melt Sandwich

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The classic tuna melt sandwich is a diner staple you can make at home! Filled with homemade tuna salad, juicy tomatoes, and melty cheese, this sandwich always hits the spot.

Every once in a while, I get a mad craving for a tuna melt.

I can’t really say why, but there’s something about those creamy, crunchy, gooey sandwiches that is so satisfying.

Good thing that tuna melts are SO easy to make at home.

I actually don’t know why we seem to reserve them for visits to the local lunch counter. For a fraction of the cost, you can whip up lunch for the whole family!

A tuna melt sandwich served up with an ice-cold lemonade or iced tea? Perfection.

Ingredients for tuna melts

Grab the following ingredients to whip up this easy tuna melt recipe. Full list and quantities are located in the recipe card.

Tuna – You’ll need two standard-size cans of tuna.

I like to use tuna that is marked as sustainable and using safe catch methods. Look for the blue Marine Stewardship Council on the labels.

Make sure to fully drain the tuna and break up any large chunks.

Mayonnaise – You can use either regular or low-fat mayonnaise. 

Celery – Chopped celery adds that classic crunch to tuna salad.

Pickle relish – For a bit of tangy flavor, I add pickle relish to my tuna salad. Use your favorite relish variety, or chopped dill pickles.

Red onion – Finely chopped red onion adds bite to the sandwich. You can also use shallot instead for a stronger flavor.

Tomato – Use a ripe slicing tomato for these sandwiches. I like to use tomatoes that are sized so I can put two tomato slices side by side on the sandwich.

Don’t like tomato? Leave it out!

Sliced cheddar cheese – Since a tuna melt is basically a fancy grilled cheese sandwich, you can’t forget the cheese! I like sharp cheddar, but you can use mild or extra-sharp.

Sandwich bread – You’ll need 8 slices of bread to make the full recipe. 

For open-face sandwiches, use 4 slices.

Salt and pepper – Season the tuna salad to taste. Remember that canned tuna does have some sodium, so don’t add too much salt right away. Taste and adjust as needed.

Butter – I use butter on the bread for these sandwiches, but you can use mayonnaise instead if you prefer. Make sure the butter is soft enough to spread on untoasted bread, otherwise your bread might rip as you’re spreading.

How to make a tuna melt

To make this tuna melt sandwich recipe, we’ll first make the tuna salad.

Drain tuna and add it to a mixing bowl. Use a fork to break up any large chunks; it will break apart further when mixing the other ingredients in.

Add the mayonnaise and stir well to evenly coat the tuna.

Stir in the diced celery, red onion, and pickle relish. Taste and add salt and pepper as desired.

From here, you can store the tuna salad in the refrigerator, or continue on to make the sandwiches.

Butter 8 slices of bread on one side and set aside.

Heat a skillet or griddle over medium heat. (A Blackstone griddle is great for cooking all the sandwiches at once!)

Place two slices of bread butter-side down on the pan. Scoop a few tablespoons of tuna salad onto each slice, carefully spreading to the edges.

Top with slices of tomato, then top with cheese slices. If needed, break the cheese slices into smaller pieces to evenly top the sandwiches. Place another slice of bread on top, butter-side up.

Cook the sandwiches until golden brown on the bottom.

Very carefully, using two spatulas if needed, flip the sandwiches and cook the other side until golden and cheese is melty.

Transfer to a plate and repeat with remaining ingredients.

Slice tuna melt sandwiches and serve with potato salad, pickled green beans, or sliced fruit!

Recipe variations

Make it spicy – Stir in a tablespoon of chipotle in adobo or add hot sauce to taste.

Make it sweet – Instead of celery, swap in diced apple.

Make it open-face – An open-face sandwich is a great option for tuna melts. Simply leave off the second piece of bread and cook the sandwiches in an oven-safe pan. Once the bread is nicely browned, broil sandwiches in the oven until the cheese is melted.

Make it not tuna – Swap in cooked diced or shredded chicken for the tuna, or use flaked cooked salmon.

Next time the craving hits, skip the restaurant and make these delicious tuna melts at home!