This is a main-course salad built from pantry staples โ canned tuna, quinoa, capers, and a handful of fresh vegetables โ pulled together with a lemon-pepper vinaigrette that actually clings. It takes 40 minutes start to finish, uses mostly one large bowl once the quinoa is done, and holds up well enough to pack for lunch the next day. If you keep oil-packed tuna in the cupboard, you probably have most of this already.
Why this recipe works
Two things make this salad reliable. First, the vinaigrette uses Dijon mustard as an emulsifier, which keeps the olive oil and lemon juice from separating and helps the dressing coat the quinoa evenly rather than pooling at the bottom of the bowl. Second, the quinoa gets spread out and cooled before everything is combined โ warm quinoa wilts the arugula on contact and turns the cucumber soft. Give it even five minutes on a plate and you avoid both problems. Everything else is straightforward assembly.
If something goes sideways
- The dressing tastes flat: Lemon juice varies a lot in acidity. Taste the vinaigrette before tossing โ if it needs more punch, add a small pinch of extra salt and a few more drops of lemon juice rather than more pepper, which can quickly overpower everything else.
- The quinoa is gummy or wet: This usually means the lid came off too early or the heat was too high. If itโs sticky, spread it on a baking sheet and let it sit uncovered for 10 minutes โ most of the excess moisture will evaporate.
- The salad is watery by the time you serve it: Cucumber releases water once itโs cut and salted. Dice it just before assembling, and if youโre working ahead, keep it separate until the last minute.
- The tuna clumps instead of flaking: Oil-packed tuna can stick together in large chunks. Drain it well, then break it apart with a fork directly over the bowl before folding it in โ this distributes it more evenly without overworking it into a paste.
- The almonds go soft: They lose their crunch quickly once they hit dressed ingredients. Add them last, right before serving โ dress it at the table if you can, since a pre-dressed salad goes limp fast.
Leftovers and meal prep
Stored in an airtight container, the dressed salad keeps for up to two days in the refrigerator, though the arugula will wilt and the almonds will soften by day two. For better results over multiple days, store the quinoa-vegetable base (tossed with the vinaigrette) separately from the tuna, arugula, and almonds โ the base keeps well for up to three days, while the tuna and greens should be added fresh each time you serve. The vinaigrette itself can be made up to five days ahead and kept in a small jar in the fridge; shake or re-whisk it before using since it will separate as it sits.
Lemon Pepper Tuna and Quinoa Salad
Equipment
- Fine mesh strainer
- Medium saucepan with lid
- Oven
- Baking sheet
- Large mixing bowl
- Small mixing bowl
- Whisk
- Chef's Knife
- Cutting board
- Measuring cups and spoons
- Fork
Ingredients
For the Quinoa:
- 1 cup white quinoa rinsed well
- 1 ยพ cups water or low-sodium vegetable broth
- ยฝ teaspoon fine sea salt
For the Toasted Almonds:
- ยฝ cup sliced almonds
For the Lemon-Pepper Vinaigrette:
- 2 tablespoons fresh lemon juice from 1 large lemon
- 1 teaspoon finely grated lemon zest
- 2 ยฝ tablespoons extra-virgin olive oil
- 1 teaspoon Dijon mustard
- ยฝ teaspoon honey or maple syrup
- 1 clove garlic small; finely grated
- 1 teaspoon coarsely ground black pepper freshly cracked, to taste
- ยผ teaspoon kosher salt
For the Tuna & Salad:
- 10 ounces oil-packed tuna drained and flaked
- 2 cups diced English cucumber 1/4-inch dice
- ยฝ cup thinly sliced red onion
- โ cup chopped flat-leaf parsley
- 2 tablespoons capers drained
- 2 cups baby arugula loosely packed
Instructions
- Rinse the Quinoa: Place the quinoa in a fine-mesh strainer and rinse under cold running water for 30โ45 seconds to remove bitterness, then drain thoroughly.
- Cook the Quinoa: In a medium saucepan, bring the water and fine sea salt to a boil over high heat. Stir in the quinoa, reduce heat to low, cover, and simmer for 15 minutes. Remove from the heat and let stand, covered, for 5 minutes. Uncover, fluff with a fork, and spread on a plate to cool slightly while you prepare the other elements.
- Toast the Almonds: Preheat the oven to 350ยฐF / 175ยฐC. Scatter the sliced almonds on a baking sheet and toast for 7โ9 minutes, shaking once, until lightly golden and fragrant. Let cool completely for crisp texture.
- Make the LemonโPepper Vinaigrette: In a small bowl, whisk together lemon juice, lemon zest, olive oil, Dijon, honey, garlic, black pepper, and kosher salt until emulsified, about 30โ45 seconds. Let the dressing rest 5 minutes to bloom the pepperโs aroma.
- Flake the Tuna: Drain the tuna well and use a fork to gently flake it into bite-size pieces, preserving some larger flakes for texture.
- Assemble the Salad Base: In a large mixing bowl, combine the slightly cooled quinoa, cucumber, red onion, parsley, and capers. Add the flaked tuna. Pour over the vinaigrette and toss gently with a broad spoon, coating without breaking the tuna. Taste and adjust salt or pepper.
- Finish and Serve: Fold in the arugula just before serving so it stays perky. Top with the toasted almonds and an extra crack of black pepper. Serve immediately, cool or at room temperature.
Notes
Chefโs Tips:
- For fluffier grains, let cooked quinoa rest 5 minutes covered, then fluff and vent on a plate to release steam.
- Freshly cracked pepper makes a big differenceโgrind medium-coarse so it pops without overwhelming the palate.
- Using low-sodium vegetable broth in place of water boosts savoriness without extra salt.
- Stir the dressing until glossy and slightly thickโthis ensures it clings to the quinoa and tuna rather than pooling.
- Fold arugula in at the end to avoid bruising; swap in baby spinach if you prefer milder greens.
- Meal Prep: Dress quinoa and vegetables up to 1 day ahead; add tuna, arugula, and almonds right before serving for best texture.
Nutrition
FAQ
Can I use water-packed tuna instead of oil-packed?
Yes, but the texture will be drier and the flavor less rich. Drain it thoroughly and add an extra half-tablespoon of olive oil to the vinaigrette to compensate.
Do I have to toast the almonds, or can I skip that step?
Raw sliced almonds work in a pinch, but toasting makes a real difference โ they go from bland and chewy to nutty and crisp. The oven is already doing nothing while the quinoa cooks, so it costs you almost no extra effort.
Can I make this salad vegetarian or vegan?
Swap the tuna for one 15-ounce can of chickpeas, rinsed and drained, and use maple syrup instead of honey in the vinaigrette. The rest of the recipe stays exactly the same.
My quinoa always turns out bitter โ what am I doing wrong?
Rinsing is the fix โ quinoa has a natural coating called saponin that tastes soapy if it isnโt washed off. Run it under cold water in a fine-mesh strainer for a full 30 to 45 seconds, not just a quick splash.
Can I use a different green instead of arugula?
Baby spinach is the easiest substitute and gives you a milder flavor. Avoid anything too sturdy like kale or romaine โ they donโt integrate as well with the quinoa and the light vinaigrette.