Tuna Fish Croissants with Apple and Dill

When I need a cold lunch that eats like it came from a little sandwich shop but doesn't cost sandwich-shop money, I make these tuna salad croissants. The creamy tuna, crisp apple, fresh dill, and buttery pastry hit that sweet-salty-crunchy thing just right.

Watch How to Make It

This is not the sad, mushy tuna salad from the back of the fridge. We're loading it up with chopped hard-boiled eggs, a little relish, punchy seasoning, and enough apple to keep every bite bright and crisp. Trust me, these disappear faster than a cold beer in July.

Why You'll Love This Recipe

I love this recipe because it is big on texture. Flaky tuna gets creamy from the mayo and eggs, celery brings a little snap if you use it, and the diced apple adds a clean, sweet crunch that keeps the filling from feeling heavy.

The dill and Old Bay give it that classic seafood-salad flavor, while Veteran's Blackened Seasoning adds a little extra savory kick. Nothing is spicy enough to scare anybody off, but there is plenty going on in that bowl.

And it feeds a crowd without making a giant mess. Make the filling ahead, keep it cold, then pile it into croissants right before lunch, game day, a baby shower, or whatever gathering has folks wandering through the kitchen looking for snacks.

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Ingredients & Tools You'll Need

You'll need four cans of light tuna packed in water, six hard-boiled eggs, mayonnaise, relish, a crisp apple, dill, Old Bay, Veteran's Blackened Seasoning, salt, and black pepper. I also like finely diced celery in mine because I am always here for extra crunch, but it is optional.

For the bread, grab six buttery croissants. Fresh bakery croissants are great, but regular store-bought ones work just fine too – especially when the filling is this good. Leaf lettuce is optional, though I like it because it gives the croissant a little barrier from the creamy tuna mixture.

You do not need fancy equipment here. A large mixing bowl, fork, cutting board, sharp knife, measuring cups and spoons, can opener, and a rubber spatula will handle the job. A small colander is helpful for draining the tuna, but the real secret is taking an extra minute to squeeze out that canned-tuna liquid.

Choose a crisp apple that holds its shape, like Honeycrisp, Gala, Fuji, Pink Lady, or Granny Smith. I usually go with a sweeter apple when I use dill relish and a tarter apple when I use sweet relish. Either way works – we are just balancing the flavors as we go.

How To Make It

This is an easy no-cook sandwich filling, so the biggest part of the job is getting the texture right. Tuna salad can go from creamy and scoopable to watery and soft in a hurry if we rush the draining and chopping.

I make the filling first, let it chill, then assemble the croissants when I am ready to serve. That rest in the refrigerator is not just for coldness – it gives the dill, relish, Old Bay, and blackened seasoning time to settle into every bite.

Preparation

Start by draining the tuna really well. Open each can, press the lid down over the tuna, and tip out as much liquid as possible. Then give the tuna a gentle press in a colander or with a fork – you want flaky tuna that looks separated and dry, not wet and shiny.

Drop the drained tuna into a large bowl and flake it with a fork. You are looking for loose, tender pieces, not a smooth paste. If you mash it too hard, the final filling can get dense and baby-food soft, and nobody is after that.

Chop the hard-boiled eggs, dice the apple small, and finely dice the celery if you are using it. Keep the apple pieces close to the size of the celery pieces so every scoop gets a little crunch instead of one giant apple chunk trying to escape the croissant.

Add the eggs, celery, relish, apple, and dill to the bowl with the tuna. Sprinkle in the Veteran's Blackened Seasoning, Old Bay, salt, and black pepper. Start light on the salt because the Old Bay and relish both bring their own salty punch.

This is where most recipes go wrong: the traditional move is to stir all the ingredients hard with a full amount of mayo right away, which crushes the tuna and lets the apple water down the filling. I fold in the mayo a little at a time, just until the tuna salad holds together and still has visible flaky pieces.

Cooking

There is no actual stovetop cooking for this one, which makes it a lifesaver on hot Texas days. The important finishing step is chilling the tuna filling for at least 30 minutes. When it is ready, the mixture should feel cold and firm on the spoon, smell fresh and herby, and look creamy without puddles of liquid collecting at the bottom of the bowl.

After chilling, taste it again. Cold food can taste less seasoned than warm food, so this is the moment to add another pinch of dill, black pepper, Old Bay, or salt if it needs it. You want a savory first bite, a little tang from the relish, and a mellow dill finish.

Split the croissants gently with a serrated knife, leaving one edge attached if you want a sturdier sandwich. Add a leaf of lettuce first if using, then spoon in a generous mound of chilled tuna salad. The croissant should feel full but still close without the filling squeezing out the sides like it is trying to make a break for it.

If you prefer a warm-crisp bread situation, lightly toast the empty croissant halves before filling them. Watch for the cut sides to turn pale golden and smell buttery, while the outside stays soft and flaky. Let them cool completely before adding the tuna salad, because warm pastry will loosen the mayo and steal that nice cold crunch.

Serving & Variations

Serve these with kettle chips, dill pickles, potato salad, fresh fruit, or a simple cucumber salad. For a backyard lunch, I would put the tuna filling in a bowl over ice, set out croissants and lettuce, and let everybody build their own. Easy hosting, no fuss.

A common consensus among home cooks is: lightly toasted croissants are delicious, but the tuna filling needs to stay cold and the bread needs to cool before assembly. That small detail keeps the pastry flaky instead of greasy and prevents the filling from turning loose.

My best pro-tip is to dice the apple, then blot it dry with a paper towel before it goes into the bowl. Apples naturally release juice after they are cut, and blotting them keeps the tuna salad thick and scoopable even after it chills. It is a tiny step, but it makes a noticeable difference if you are making the filling ahead.

Use sweet relish for a sweeter, old-school picnic flavor, or dill relish for a tangier sandwich. Fresh dill tastes grassy and bright, while dried dill has a deeper pantry-herb flavor – both are good, so use what you have. You can also skip the celery if your crew is not into it, though I would keep the apple because that crisp bite is the whole deal.

For make-ahead lunches, store the tuna salad in an airtight container in the refrigerator and keep the croissants separate. Assemble right before eating so the bread stays tender and flaky. Leftover filling is great for up to three days when kept cold, but I do not recommend freezing it because the mayo, eggs, and apple will lose their good texture.

Wrapping Up

This is the kind of sandwich I keep in my back pocket when lunch needs to be quick but still feel special. Creamy tuna, tender egg, sweet apple, dill, and buttery croissants might sound simple, but together they make a cold sandwich with serious personality.

Make the filling, chill it until those flavors settle in, and do not skip that apple-blot trick. You'll see why this one earns a regular spot in the lunch rotation.

Recipe created by Blue Collar Chef for Trust Me Try It.

Tuna Fish Croissants with Apple and Dill

5 from 1 vote

Print Pin Rate

Prep Time: 10 minutes minutes

Cook Time: 20 minutes minutes

Total Time: 30 minutes minutes

Servings: 8

Ingredients

• 4 can light tuna in water, drained 5 oz
• 6 hard boiled eggs, chopped
• 2 stalks celery, finely diced optional
• 1/4 cup relish sweet or dill
• 1 finely diced apple any crisp variety
• 1-2 tsp dill (fresh or dried to taste
• 1/2 tsp Veteran’s Blackened
• Seasoning
• 1-2 tsp Old Bay Seasoning
• Salt & black pepper to taste
• 1/2 cup mayonnaise adjust to your preference
• 6 buttery croissants
• Leaf lettuce optional

Instructions

• In a large bowl, flake the drained tuna with a fork.
• Add chopped eggs, celery (if using), relish, diced apple, and dill.
• Sprinkle in Veteran’s Blackened Seasoning, Old Bay, salt, and black pepper.
• Add mayonnaise and gently mix until everything is well combined.
• Taste and adjust seasonings as needed.
• Chill in the fridge for at least
• 30 minutes for best flavor.
• Spoon tuna mixture onto buttery croissants. Add lettuce if using.
• Serve chilled and enjoy!