A good tuna sandwich doesn’t need a long ingredient list or complicated preparation. Sometimes one simple ingredient is all it takes to turn an everyday lunch into something you’ll want to make again and again.
This creamy tuna sandwich combines flaky canned tuna with mayonnaise, crisp red onion, celery, Dijon mustard, and a surprisingly delicious addition: sweet pickle relish.
That little touch of sweetness and tang gives the tuna mixture a much more balanced flavor and makes an ordinary tuna sandwich taste special. The original recipe also recommends lightly grilling or toasting the bread for extra crunch.
Whether you’re making lunch for yourself, packing a sandwich for work, or looking for an easy family meal, this recipe comes together in just minutes.
Why You’ll Love This Tuna Sandwich
There are plenty of tuna salad recipes, but this one stands out because of the combination of creamy, crunchy, tangy, and slightly sweet flavors.
The tuna provides protein and a savory base. Mayonnaise makes everything creamy, while finely chopped celery adds a fresh crunch.
Red onion brings a little sharpness, Dijon mustard adds tang, and sweet relish provides the unexpected flavor that ties everything together.
The original recipe describes sweet relish as its “secret ingredient” and says it gives the sandwich a sweet-and-tangy flavor boost.
And because you don’t need to cook the tuna mixture, lunch can be ready in about 10 minutes.
Ingredients You’ll Need
- 2 cans tuna, drained
- 1/4 cup mayonnaise
- 1 tablespoon Dijon mustard, optional
- 1 small red onion, finely chopped
- 1/4 cup celery, finely chopped
- 1/4 cup sweet pickle relish
- Salt, to taste
- Black pepper, to taste
- Bread of your choice
- Cheese slices, optional
- Lettuce, optional
- Tomato slices, optional
The original recipe uses two cans of drained tuna along with mayonnaise, Dijon mustard, red onion, celery, and sweet relish.
How to Make the Tuna Salad
1. Drain the Tuna
Open the tuna cans and drain them thoroughly.
Excess liquid can make the tuna mixture watery, so press out as much liquid as possible before adding the tuna to your bowl.
Place the drained tuna in a medium mixing bowl.
2. Add the Mayonnaise
Add the mayonnaise to the tuna.
Start with the recommended amount and mix everything together.
If you prefer a creamier tuna salad, you can add a little more mayonnaise later.
It’s better to add it gradually than to make the mixture too wet.
3. Add Dijon Mustard
Stir in the Dijon mustard.
The mustard is optional, but it adds a subtle sharpness that balances the creamy mayonnaise and sweet relish.
If you prefer a milder tuna salad, you can leave it out.
4. Add the Vegetables
Add the finely chopped red onion and celery.
Make sure the pieces are small so that you get a little bit of everything in each bite.
The celery is especially useful because it adds crunch to an otherwise creamy mixture.
5. Add the Secret Ingredient
Now add the sweet pickle relish.
This is what gives the tuna salad its distinctive sweet-and-tangy flavor.
Stir until the relish is evenly distributed throughout the mixture.
Don’t underestimate this small amount. The combination of sweet relish, mustard, and tuna creates a surprisingly balanced flavor.
6. Season
Add salt and freshly ground black pepper to taste.
Mix everything together thoroughly.
Taste the tuna salad before assembling the sandwiches and adjust the seasoning if necessary.
Toast the Bread
The original recipe recommends lightly toasting the bread and suggests grilling it with a little butter for an extra flavorful, crunchy finish.
You can use:
- White bread
- Wheat bread
- Sourdough
- Multigrain bread
- Brioche
- Sandwich rolls
- English muffins
For an especially satisfying sandwich, lightly butter the outside of the bread and toast it in a skillet until golden.
The contrast between crisp bread and creamy tuna salad is excellent.
Assemble the Sandwich
Place one slice of toasted bread on a plate.
Spread a generous layer of tuna mixture over the bread.
If you’re using cheese, add a slice on top.
Add lettuce and tomato if desired.
Place the second slice of bread on top.
Cut the sandwich in half and serve immediately.
The original recipe suggests serving the sandwich alongside soup, such as tomato soup.
What Makes the Sweet Relish So Good?
Sweet relish may seem like an unusual addition if you’ve always made tuna salad with only mayonnaise and vegetables.
But it works because tuna has a naturally savory flavor.
The relish introduces sweetness, acidity, and a little pickle flavor at the same time.
That contrast keeps the tuna salad from tasting heavy or flat.
If you’re skeptical, start with the recommended 1/4 cup and taste the mixture before adding anything else.
You may be surprised by how much difference it makes.
Should You Use Dijon Mustard?
Dijon mustard is optional.
It adds a mild sharpness that works well with the sweet relish.
If you like tangy sandwiches, keep it in.
If you’re making the tuna salad for children or prefer a softer flavor, simply leave it out.
You can also substitute regular yellow mustard for a milder, more familiar mustard flavor.
How to Make the Best Tuna Sandwich
Drain the tuna well. Too much liquid can make the mixture watery.
Chop the vegetables finely. Small pieces distribute more evenly.
Don’t overdo the mayonnaise. Add enough to make the tuna creamy without drowning out the other flavors.
Don’t skip the relish. It’s the ingredient that gives this recipe its signature sweet-and-tangy character.
Toast the bread. A crisp exterior adds wonderful contrast.
Taste before serving. Tuna and mayonnaise can vary in saltiness, so adjust the seasoning according to your ingredients.
Easy Variations
Tuna Melt
Turn this into a classic tuna melt by placing the tuna mixture on toasted bread, adding cheese, and heating it until the cheese melts.
Cheddar, provolone, Swiss, or American cheese all work well.
Spicy Tuna Sandwich
Add a few drops of hot sauce, diced jalapeño, or a pinch of crushed red pepper.
The heat works particularly well with the sweet relish.
Extra Crunchy Tuna Salad
Add finely chopped pickles, extra celery, or a few diced cucumber pieces.
Creamy Avocado Tuna
Replace part of the mayonnaise with mashed avocado for a different creamy texture.
Add a squeeze of lemon or lime to keep the flavor bright.
Lettuce-Wrapped Tuna
Skip the bread and spoon the tuna salad into crisp lettuce leaves for a lighter option.
What to Serve With a Tuna Sandwich
A tuna sandwich is filling enough on its own, but simple sides make it feel like a complete meal.
Try serving it with:
- Tomato soup
- Potato chips
- Pickle spears
- Coleslaw
- Green salad
- Fresh fruit
- Vegetable sticks
- French fries
A bowl of warm tomato soup is especially comforting alongside a crisp, toasted tuna sandwich.
Can You Make Tuna Salad Ahead?
Yes.
The tuna mixture can be prepared ahead and refrigerated in a covered container.
This makes it especially convenient for weekday lunches.
When you’re ready to eat, simply stir the mixture and spread it onto fresh bread.
If the tuna salad becomes slightly dry after refrigeration, stir in a small amount of mayonnaise.
How to Store Tuna Salad
Keep the prepared tuna mixture refrigerated in an airtight container.
Don’t leave tuna salad sitting at room temperature for extended periods.
For the best texture, keep the bread separate until you’re ready to assemble the sandwich. This prevents the bread from becoming soggy.
Frequently Asked Questions
Can I use tuna packed in water?
Yes. Tuna packed in water works very well and is an easy choice for this recipe.
Can I use tuna packed in oil?
Yes. Drain it thoroughly before mixing. Oil-packed tuna will generally give the salad a richer flavor.
Can I replace sweet relish with chopped pickles?
Absolutely. Finely chopped sweet pickles are a good substitute.
If you prefer a more savory flavor, dill pickles can be used instead.
Can I leave out the onion?
Yes. The recipe will still work without onion, although you’ll lose some of the sharpness and crunch.
Can I add hard-boiled eggs?
Definitely. Finely chopped hard-boiled egg makes tuna salad richer and adds another layer of texture.
Why is my tuna salad watery?
Usually, the tuna wasn’t drained thoroughly or too much liquid was added. Drain the tuna well and add mayonnaise gradually.
A Simple Lunch You’ll Want to Make Again
This tuna sandwich proves that an everyday lunch can become something special with just a few simple ingredients.
Creamy mayonnaise, crunchy celery, sharp red onion, tangy Dijon mustard, and sweet pickle relish transform ordinary canned tuna into a flavorful sandwich filling.
The real star is the sweet relish. That small addition gives the tuna salad the sweet-and-tangy balance that makes this recipe stand out.
Toast the bread until golden, pile on the tuna mixture, add cheese or fresh vegetables if you like, and serve it with a bowl of tomato soup for the ultimate comforting lunch.
Once you try this version, plain tuna salad may never taste quite the same again.
