Tuna Salad Sandwich Croissant

Daisy Merano

Updated: June 22, 2025

The tuna salad sandwich is one of the go-to staples found in lunchboxes, diners, and delis, especially in the United States. You’ll often see it on croissants, toast, wheat bread, or sometimes even stuffed in tomatoes during springtime gatherings. People enjoy it cold or at room temperature, and it remains a staple during potlucks, office lunches, or quick afternoon breaks.

I like how fast it comes together, especially when I serve it with plain potato chips or coleslaw on the side. It’s a speedy fix that doesn’t skip on comfort, we will use made croissants for this tuna salad sandwich. For this one, I added scallions for brightness, sweet relish for that mild tang, and a touch of garlic powder for extra bite. Using croissants instead of regular sandwich bread gave it a softer feel without getting soggy.

What is a Tuna Salad Sandwich Croissant?

The tuna salad sandwich is a cold sandwich that uses canned tuna mixed with mayonnaise and other chopped ingredients, usually piled between slices of bread. The word “salad” in its name refers to how the tuna is prepped, similar to egg salad or chicken salad. It likely grew in popularity in the early 20th century when canned fish became widely available across the U.S., especially as a lunch option during workdays.

It’s commonly eaten throughout the United States, especially in packed lunches and cafés. Outside of the U.S., people adapt the recipe depending on local preference. Well, some use yogurt instead of mayo, while others skip relish entirely. One common assumption is that it always uses white sandwich bread, but that’s not true. You’ll see it in croissants, whole-grain buns, and wraps too, and this version of mine uses croissants.

Sandwiches don’t have to be boring. Let’s check out the ingredients that give this version a fresh feel.

Ingredients of Tuna Salad Sandwich Croissant

Tuna (12 oz, canned) – This is the main star. Go for water-packed or oil-packed tuna, but always drain it well to avoid sogginess.
Red onion (½ piece, minced) – Gives a sharp and clean flavor. Mincing it keeps the bite mild and distributes it evenly.
Scallions (4 stalks, minced) – These provide a softer onion note with fresh green color. I often use both the white and green parts for full flavor.
Celery (1 stalk, minced) – Adds crunch and moisture. It’s important to chop it finely so it blends into the salad without taking over.
Sweet pickle relish (2½ tablespoons) – Lends a gentle sweetness and mild acidity. This keeps the tuna mix from tasting too flat.
Parmesan cheese (2 tablespoons) – This adds a nutty, salty finish. It also thickens the mixture slightly.
Garlic powder (¼ teaspoon) – Brings in mild warmth. It ties the flavors together without standing out.
Mayonnaise (5 tablespoons) – Binds everything into a smooth mixture. It’s the base that holds the tuna and veggies in place.
Croissants (4 pieces) – Soft, buttery, and ideal for cold fillings. Their airy layers let the tuna salad sit without weighing it down.
Lettuce leaves (4 pieces) – Used as a barrier between bread and salad. This keeps the croissants dry and adds a cool crunch.

How This Tuna Salad Sandwich Croissant Stands Out

Most tuna salad sandwich recipes online lean either too creamy or too plain. Some versions stick only with mayo, tuna, and onion, which ends up flat in flavor. Others overdo it with hard-boiled eggs or too many crunchy add-ins, which makes the filling fall apart. This version strikes the right mix. Because remember, I want it to be speedy and no-hassle. This tuna salad sandwich recipe stays compact, flavorful, and spreadable, which is great for croissants that tend to fall apart with heavy fillings.

How to Cook Tuna Salad Sandwich Croissant

Prepare and drain the tuna properly – Open the canned tuna and pour out all the liquid, whether it’s water or oil. I press the lid gently while draining to remove any excess. This helps avoid watery filling that can ruin the croissant. Set the tuna aside in a mixing bowl.
Chop everything you’ll need – Use a sharp knife to finely mince the red onion, scallions, and celery. The red onion gives the strongest bite, so I make sure to chop it extra fine. The scallions give a mild flavor and blend well with the tuna. Celery brings crunch, but too much chunk can overpower the mix, so small cuts are better.
Combine the vegetables and tuna – Add the chopped red onion, scallions, and celery into the bowl with the tuna. Add the sweet pickle relish right after so it blends evenly. I always stir this gently to keep the tuna from breaking too much. Use a fork or spoon to mix everything just until combined.
Add mayonnaise and seasonings – Spoon in 5 tablespoons of mayonnaise, sprinkle in 2 tablespoons of Parmesan cheese, and add ¼ teaspoon of garlic powder. Stir again until everything looks smooth and evenly coated. I like tasting it at this stage and adjusting the salt if needed, though Parmesan usually gives enough saltiness. Make sure the salad holds its shape without looking dry.
Slice the croissants gently – Use a serrated knife and cut the croissants in half horizontally. Avoid pressing them down, let the knife do the work so the layers don’t flatten. I open them just enough to make space for filling. Set each half on a clean board, ready for assembly.
Layer the lettuce and tuna salad – Lay one lettuce leaf on the bottom half of each croissant. This keeps the bread dry and crisp. Scoop a good amount of tuna salad onto the lettuce. Use a spoon or spatula to spread it out evenly without flattening the croissant.
Cover and serve – Place the top half of the croissant over the filling. Press gently but don’t compress it. Serve immediately, or wrap each one in parchment if packing for later. I like to chill them a bit first if I’m bringing them outside.

What to Have with Tuna Salad Sandwich Croissant

Your Tuna Salad Sandwich Croissant is nutritious and filling enough to be eaten solo, that’s for sure. However, it’s natural to crave something else alongside your sandwich. Don’t worry because I’ve got two best suggestions here:

Classic potato chips – No sandwich combo feels more right than chips and tuna. They give salt and snap that contrast the soft filling. I don’t have from scratch potato chips, but I have something greater. Try my taco bake recipe – much indulgent and savory.
Tomato basil soup – A warm bowl of tomato soup cuts through the creamy mayo with tonally balanced sweetness and acidity .
Macaroni salad – Its soft pasta and mild mayo base echo the tuna salad while offering chewy contrast
Creamy coleslaw – This chilled mix of cabbage, mayo, and vinegar gives a cooling crunch that mates well with tuna salad croissants .

This meal checks all boxes: a flaky croissant, creamy tuna, and pick-me-up sides. You get texture, flavor range, and a balanced lunch that sticks to a quick prep time. Take your tuna salad sandwich setup up a notch, wrap it all in parchment, and you’ve got a portable, tasty midday treat.

Pair it wisely and enjoy that satisfying, crispy-chewy contrast with every bite.