Lemony Tuna Salad Sandwich

Ingredients

• 2 cans (142 g each; 5 oz each)albacore tuna, preferably packed in olive oil
• 50 g (⅓ cup)celery, finely diced
• 80 ml (⅓ cup)Kewpie mayonnaise
• 2 tablespoonsshallots, diced
• 2 teaspoonslemon zest
• 2 tablespoonsfreshly squeezed lemon juice
• 2 teaspoonsbrine from a jar of pepperoncini
• 1 teaspoonDijon mustard
• 1 teaspooncapers, chopped
• As neededkosher salt
• As neededfreshly ground black pepper
• 1Stirato or French baguette, halved lengthways and across the middle
• 8pepperoncini peppers, thinly sliced

Instructions

1. 1

   Mix the tuna

   In a medium mixing bowl, combine the tuna, celery, Kewpie mayonnaise, shallot, lemon zest, lemon juice, pepperoncini brine, Dijon mustard and capers. Mix until combined, then season to taste with salt and pepper.

2. 2

   Fill the bread

   Spread the tuna salad over the bottom halves of the bread and arrange the sliced pepperoncini on top. Close the sandwiches, cut each in half and serve.

What is a tuna salad sandwich?

Tuna salad sandwiches are a familiar American lunch, typically made by mixing canned tuna with a creamy dressing and serving it in bread. This version adds lemon and pepperoncini for a sharper, more briny flavour.

The combination works because rich mayonnaise and tuna are offset by citrus, mustard and the pepperoncini’s tangy jar brine. A baguette gives the filling a sturdy, crisp-edged home.

Nutrition and macros by portion

The nutrition label shows one serving as written: 606 calories, 14g protein, 66g carbs, 32g fat.

The bread supplies most of the carbohydrates, while the mayonnaise and olive oil-packed tuna contribute much of the fat. Tuna provides the protein, with the other ingredients adding flavour and crunch. Balance the sandwich with a side of salad or fresh vegetables.

Choosing the tuna

Oil-packed tuna: The recipe recommends albacore packed in olive oil, which brings richness to the filling. Drain it before mixing so the salad stays cohesive rather than oily.

Flaking: Break the tuna into bite-sized pieces as you mix, but avoid mashing it completely if you want some texture in each sandwich.

Building the lemony dressing

Lemon: Zest contributes fragrant citrus notes, while the juice gives the salad its fresh acidity. Add both to the tuna mixture so the flavour is evenly distributed.

Brine and capers: These bring a savoury, salty tang alongside the Dijon. Taste before adding salt, as the brine and capers may already provide enough seasoning.

Getting the texture right

Celery: Finely diced celery adds a crisp contrast to the creamy dressing. Keeping the pieces small makes the filling easier to spread and eat.

Mayonnaise: Mix it in until the tuna is coated, rather than adding extra by default. The finished salad should hold together when spread without becoming runny.

Assembling the sandwiches

Bread: Halve the baguette lengthways and across its width as directed, then spread the tuna salad over the bottom sections. This gives you two sandwiches to close and cut in half for serving.

Pepperoncini: Layer the sliced peppers over the filling just before closing the bread. Their bright, tangy bite is a clear contrast to the creamy tuna.

Serving ideas

Serve the sandwiches as soon as they are assembled, while the baguette still has its fresh texture. A simple green salad or sliced vegetables make an easy accompaniment.

Because the filling is rich and savoury, crisp, fresh sides work particularly well. Keep extra pepperoncini on the table for anyone who would like more tang.

Recipe notes & tips

• Drain the tuna before mixing to keep excess oil from loosening the filling.
• Finely dice the celery and shallot so they distribute evenly through the salad.
• Taste the mixture before adding salt because the capers and pepperoncini brine are already savoury.
• Use a fine grater for the lemon zest, taking care to avoid the bitter white pith.
• Spread the tuna salad evenly to make the sandwiches easier to close and cut.

Variations

• Add herbs: Stir chopped parsley or dill into the tuna mixture for a fresh herbal note.
• Use a different bread: Fill rolls or sliced sandwich bread if you do not have a baguette.
• Make it spicier: Add extra sliced pepperoncini for more heat and tang.
• Add lettuce: Tuck crisp lettuce into the sandwich just before serving.
• Adjust the citrus: Start with less lemon juice and add more to taste for a gentler tang.

Common mistakes to avoid

• Skipping the drain: Excess liquid can make the filling loose; drain the tuna before combining it with the other ingredients.
• Over-mixing: Mashing the tuna too thoroughly can leave the salad pasty; mix just until combined.
• Adding salt too soon: Capers and pepperoncini brine are salty; taste the mixture before seasoning.
• Using large celery pieces: Big chunks can make the sandwich awkward to bite; dice the celery finely.
• Filling too far ahead: The bread can soften against the salad; assemble close to serving time.

How to store

Store leftover tuna salad in a covered container in the refrigerator and use within 3 days. Keep it separate from the bread, then assemble the sandwiches just before serving; serve the tuna salad cold rather than reheating it.

Frequently asked questions