Best Tuna Fish Recipe With Vibrant Quick-Pickled Red Onions

When it comes to easy lunch ideas, I always turn to a hearty and satisfying tuna salad that actually tastes fresh.

This isn’t just another boring tuna sandwich; it’s the creamiest, freshest version you’ll find, elevated by the bright pop of color and flavor from quick-pickled onions. This best tuna fish recipe transforms a simple pantry staple into a truly satisfying meal that feels special, even on a busy Tuesday. The secret ingredient—a vibrant quick-pickled red onion—is a game-changer that adds tangy brightness and cuts through the richness of the mayo. This healthy, easy dinner idea is guaranteed to become a family favorite, whether served on toast or in lettuce wraps as a low-carb meal.

Ingredients

2 cans (each 142 g / 5 oz) solid white albacore tuna in water, well-drained
Choose high-quality solid white albacore for better texture and less fishy flavor. Draining thoroughly (pressing out all excess water) is critical to prevent a watery salad and ensure a creamy consistency. Using tuna packed in water keeps the salad lighter and makes this a healthy tuna fish recipe option.
120 ml (1/2 cup) high-quality mayonnaise, alcohol-free
The amount of mayonnaise can be adjusted based on personal preference for creaminess. Ensure the mayo is fresh to maintain the best flavor profile. For a healthier alternative for low-carb meals, substitute with full-fat plain Greek yogurt.
1 celery stalk, finely diced (about 60 g / 2 oz)
Make sure the dice is fine and consistent for an even distribution of crunch. Celery adds a necessary texture contrast and savory bite to the creamy tuna.
1 small red onion (about 150 g / 5.3 oz), thinly sliced for pickling
Red onions provide the perfect sharpness for pickling and turn a beautiful pink color. Slice as thinly as possible using a mandoline or sharp knife for quick pickling. If you prefer a milder flavor, you can briefly soak the onions in ice water before pickling.
120 ml (1/2 cup) apple cider vinegar
Apple cider vinegar adds a subtle fruity sweetness that balances the onion’s sharpness. For a tangier result, white distilled vinegar can be used as a substitute.
120 ml (1/2 cup) water
15 g (1 tablespoon) granulated sugar
3 g (1/2 teaspoon) fine sea salt, plus more for seasoning
Use fine sea salt for easy dissolution in the pickling liquid. Adjust the seasoning at the end to match your taste preferences for this easy tuna fish recipe.
1.5 g (1/4 teaspoon) freshly cracked black pepper
Freshly cracked pepper provides a stronger aromatic kick than pre-ground pepper.
5 g (1/4 cup) fresh dill, finely chopped, for garnish
Fresh dill is highly recommended over dried dill for its bright, grassy flavor. Dill pairs exceptionally well with both fish and the pickled onions, enhancing the overall profile of this best tuna fish recipe.

Instructions

Begin by preparing the quick-pickled red onions.
In a small heatproof bowl, combine the thinly sliced red onion. In a separate small saucepan, bring the apple cider vinegar, water, granulated sugar, and 3 g (1/2 teaspoon) fine sea salt to a simmer over medium heat, stirring until the sugar and salt are fully dissolved. Carefully pour the hot pickling liquid over the sliced red onions, ensuring they are fully submerged, and allow them to cool to room temperature (about 15-20 minutes) before letting them steep for at least 30 minutes to absorb the flavor. The color will turn vibrant pink as they steep.
While the onions are pickling, prepare the tuna base.
Open the tuna cans and drain them very well; use a fork or potato masher to press out all excess water for a creamy, non-watery salad. Transfer the drained tuna to a medium mixing bowl and flake it gently with a fork, avoiding mashing it completely to retain some texture.
Assemble and season this healthy tuna fish recipe.
Add the finely diced celery, the alcohol-free mayonnaise, 3 g (1/2 teaspoon) fine sea salt, and freshly cracked black pepper to the flaked tuna. Drain the pickled onions (reserving about 2 tablespoons for garnish) and add the remaining drained onions to the bowl. Mix gently until all ingredients are just well combined and creamy; avoid overmixing to keep the texture appealing.
If the mixture looks too dry, try adding an extra tablespoon of mayonnaise or a splash of water from the reserved pickled onions liquid.
Finish and serve with garnish.
Taste and adjust seasoning as needed, adding a little extra salt or pepper if desired. To serve, spoon a generous portion of this best tuna fish recipe onto a rustic ceramic plate, ideally over a slice of lightly toasted artisanal bread or nestled in crisp lettuce cups. Artfully arrange the reserved vibrant pink pickled red onion slices on top of the tuna salad and sprinkle with finely chopped fresh dill. The fresh dill provides a fresh green contrast that enhances the visual appeal.

Simple Variations for the Perfect Tuna Sandwich

A great recipe offers flexibility, and this best tuna fish recipe is no exception. While the pickled red onions provide a unique twist, you can customize the base to create new family favorites.

For extra tangy sweetness, add a spoonful of sweet relish or diced cornichons alongside the pickled onions.
Incorporate hard-boiled egg for a richer, more substantial texture, cutting back slightly on the mayonnaise for a high-protein meal.
Add a pinch of smoked paprika or a dash of hot sauce for a hint of smoky heat.
For easy dinner ideas, serve it open-faced under a broiler with melted sharp cheddar cheese for a hearty tuna melt.

Make-Ahead and Storage Tips for Busy Families

This recipe is perfect for healthy meal prep, allowing you to prepare components ahead of time for quick weekday lunches.

Prepare the quick-pickled onions up to 5 days in advance and store them in an airtight container in the refrigerator.
The assembled tuna salad can be stored in the refrigerator for up to 3 days in an airtight container.
To keep the crunch, avoid adding the pickled onions until just before serving if possible, though the flavor will hold well overnight.
For portioning, prepare a batch of the best tuna fish recipe on Sunday and pack it into individual containers for quick weekday lunches, keeping the lettuce cups separate until serving.

FAQs

Can I use chunk light tuna instead of solid white albacore?

Yes, you can. Chunk light tuna is a little softer and has a stronger flavor; adjust the mayonnaise if necessary to achieve the desired texture. Solid white albacore tends to be flakier and less ‘fishy’ tasting, making it ideal for this recipe.

How do I keep the best tuna fish recipe from getting watery?

The most important step is thoroughly draining the tuna before mixing. Pressing the tuna against the side of the can or using a sieve helps remove excess water. If you’re using a lighter mayo or yogurt substitute, start with half the amount and add slowly to control moisture.

Can I make this recipe without mayonnaise?

Yes, for a lighter option, substitute mayonnaise with full-fat Greek yogurt or use a homemade dressing with olive oil, lemon juice, and a little Dijon mustard. This variation makes for a great high-protein snack or low-carb meal option while still maintaining a creamy texture.

What other herbs pair well with this tuna fish recipe?

Fresh parsley, chives, or tarragon are excellent substitutes for dill, each adding a unique aromatic profile. I find that a mix of fresh chives and parsley works really well if you aren’t a fan of dill.

How long do the pickled red onions last?

When stored in the refrigerator in the pickling liquid, the onions can last for up to two weeks, becoming softer and slightly less sharp over time. For the best crunchy texture, I suggest using them within 5 days.

What are the best ways to serve this tuna salad?

This versatile recipe works great on toasted bread, in a sandwich with lettuce and tomato, or stuffed into bell peppers or crisp lettuce cups as a gluten-free option. It also pairs perfectly with crackers for a high-protein snack.

Conclusion

This best tuna fish recipe transforms a simple lunch into a vibrant, flavorful meal that families will truly look forward to. The small extra step of quick-pickling the red onions provides a huge payoff in flavor and texture, turning a classic into a new favorite. Save this recipe on Pinterest for your next family dinner or healthy meal prep session.