This Basque-Style Tuna Tomato Salad Tastes Like Spain: This Spanish tuna and tomato salad is one of those simple dishes that we love to make time and time again. We first fell in love with it in a traditional Basque Restaurant near the Oma Forest. We're using ripe tomatoes, good olive oil, quality canned tunaand enough salt and pepper to make everything pop.

What makes this version extra crave-able is the contrast of juicy tomatoes and rich tuna with thin-sliced red onion and a handful of crunchy fried onions on top. It's fresh, salty, bright, and satisfying in the best way. We like to serve it with crusty bread for an easy lunch that feels restaurant-worthy with almost no work.

At Avdaye, we add lots of tips in all of our recipes – because we are a home cook without any formal training, and we find we are more confident making dishes when we understand why it works, and what each ingredient means to the flavor of a recipe. Our goal is for even the most beginner home cook to feel empowered in the kitchen.

How to Make Tuna Tomato Salad

This Spanish tuna and tomato salad is a Basque-inspired favorite made with ripe tomatoesolive oil canned tunared onion, and crunchy fried onions. Fresh, savory, and ready in minutes, it's solid as a light lunch tapas-style starter, or easy side with crusty bread.

This dish is a solid when served family style in a large bowl with salad forks so everyone can dig in. We sprinkled the fried onions on top for photographs, but we usually arrange them around the sides of our dish, so everyone can grab the amount they like to sprinkle on top.

If you have any, season them with Maldon salt or another coarse Celtic sea salt and freshly ground pepper.

To learn more about our trip through Basque countrysome of the things we saw and flavors we tasted, visit our Basque Travel guideand learn more about Visiting the Oma Forest and Basque coast.

Ingredients for Spanish Tuna and Tomato Salad

To make this recipe, we will gather the following ingredients:

Heirloom Tomato or Medium Tomatoes: Provides a juicy, sweet, and slightly tangy base. The tomatoes are the star of the salad, offering vibrant color and freshness.
Thin Sliced Red Onion or Pickled Red Onion: Adds a sharp, pungent flavor that contrasts nicely with the sweetness of the tomatoes. Pickled red onions add a tangy, slightly sweet note.
Good Quality Spanish Olive Oil: Brings a rich, fruity, and slightly peppery flavor, enhancing the overall taste and providing a smooth texture.
Bonito Tuna from Spain, Drained: Adds a savory, meaty element with a delicate, mild fish flavor. The tuna provides protein and a satisfying richness to the salad.
Fried Onions: Offers a crunchy texture and a slightly sweet, caramelized onion flavor. These add a delightful contrast to the other ingredients.
Balsamic Vinegar: Adds a tangy, slightly sweet acidity that balances the richness of the olive oil and the savory tuna. It helps to marry the flavors together.

Tuna and Tomato Salad Step by Step

Once we gather our ingredients, we will use the following process:

Prepare the Tomatoes: Slice the heirloom tomato (or two medium tomatoes) thinly. Arrange the tomato slices on a serving plate.
Add the Onions: Thinly slice the red onion or use pickled red onion for added flavor. Scatter the sliced onions over the tomato slices.
Add the Tuna: Drain the can of Bonito Tuna and break it into chunks. Place the tuna chunks evenly over the tomatoes and onions.
Dress the Salad: Drizzle the good quality Spanish olive oil over the salad. Add the tablespoon of balsamic vinegar.
Add Fried Onions: Sprinkle 1-2 tablespoons of fried onions (optional) over the top for added crunch.
Season and Serve: Garnish with salt and pepper to taste. Serve immediately and enjoy!

Tuna Tomato Salad Variations

Try these good easy variations – from traditional to creative – to find the flavor you love the best!

Capers and Olives. Add a briny, salty kick with caper berries, pitted kalamata olives, or capers!
Red peppers & basil. Roasted red peppers and a pop of fresh basil are traditional additions to this simple salad, and bring a sweet, herbal pop of flavor.
Egg & Potatoes. Eggs are a huge part of Spanish cuisine – from tortillas (omelets) to hard-boiled eggs, you'll find eggs in lots of Spanish dishes. Chopped hardboiled eggs and griddled or roasted potatoes can make this salad heartier, so it's more of a main dish.
Green Beans & Cherry tomatoes. Green bean salad is fabulous with crisp, parboiled green beans, with cherry tomatoes instead of sliced tomatoes.
Crunchy hot sauces: we love the spicy, salty, umami flavors Fly by Jing sauces have – and often ladle heaping spoonfuls over this salad.

Kitchen notes

Slice Tomatoes Evenly: Slice the tomatoes evenly to ensure a uniform texture and presentation. Use a sharp knife to avoid crushing the tomatoes.

Use High-Quality Tuna: Opt for high-quality canned tuna, such as Ortiz Bonito del Norte or Matiz Bonito del Norte any reputable brand. The quality of the tuna significantly impacts the flavor of the salad. You can use brands like Fishwife for unique flavor twists.

Drain the Tuna Well: Ensure the tuna is well-drained. You can also gently flake the tuna with a fork to create a more even distribution.

Balance the Flavors: The balance between the acidity of the vinegar, the richness of the olive oil, and the sweetness of the tomatoes is crucial. Taste and adjust the seasoning as needed.

Our Pro Tip

Recipe Tip

Choose the most flavorful tomatoes. Since we're not using many ingredients, they each need to bring strong flavor – and picking the right tomato is crucial. Pick any tomato you love the flavor of, and use ripe tomatoes. If you don't have heirloom, no worries – other types of ripe tomatoes work fine. Use what you love!

Add Fresh Herbs: Fresh herbs like parsley, basil, or cilantro can add a burst of flavor and freshness. Add them before serving to maintain their vibrant color and taste.

Incorporate Crunch: Adding a crunchy element, like fried onions or croutons, can enhance the texture of the salad. Add them before serving to keep them crispy.

Season Generously: Don't skimp on salt and pepper. Seasoning enhances all the flavors in the salad. Taste and adjust as necessary.

Chill Before Serving: Let the salad chill in the refrigerator for about 15-30 minutes before serving. This helps the flavors meld together.

Use Good Quality Olive Oil: Use extra virgin olive oil for its superior flavor and health benefits. It adds a rich, fruity note to the salad.

Experiment with Additions: Don't be afraid to experiment with additional ingredients like capers, olives, roasted peppers, or avocado to add complexity to the salad.

Serve with Fresh Bread: Serve the salad with a side of fresh crusty bread to soak up the good juices and oil.

Pickled Onions for Extra Zing: If you like a bit of tanginess, use pickled red onions instead of fresh. They add an extra layer of flavor and a nice crunch.

Presentation Matters: Arrange the ingredients neatly and consider layering them for a visually appealing presentation. A beautifully arranged salad is more inviting.

Use Balsamic Glaze for Drizzling: For a touch of sweetness and a gourmet touch, drizzle a balsamic glaze instead of regular balsamic vinegar.

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Spanish Tuna Tomato Salad FAQs

What makes this salad Spanish or Basque-style?

It's all about the simple combination of ripe tomatoes, olive oil, and tuna — a classic pairing you'll see served in Basque restaurants as a light starter or tapas-style plate.

What kind of tomatoes should we use?

Ripe, juicy tomatoes like vine-ripened, heirloom, or Roma work great. Use what looks best.

What tuna is best for tuna and tomato salad?

High-quality canned tuna is ideal. Oil-packed tuna has the richest flavor, but either works.

Can we make this ahead of time?

You can prep the tomatoes and onions ahead, but add tuna and crunchy onions right before serving for best texture.

How do we keep it from getting watery?

Salt the tomatoes and let them sit, then spoon off excess liquid if needed before adding tuna.

What should we serve with this?

Crusty bread is classic. It's also great with olives, roasted peppers, or a simple soup.