Salmon Over Lemony Lentils and Arugula
Roasted salmon rests on a warm salad of tender lentils, peppery arugula, and halved cherry tomatoes, all tossed with a bright Dijon-lemon dressing and fresh dill.
Why You'll Love This Recipe
Something you would order out, made in about half an hour. Roasted salmon sits on a warm, dressed lentil salad, so you get a hot main and a hearty side in one bowl. It's for anyone who wants a plate that feels substantial and put-together without a long list of steps or a sink full of pans, and it works just as well for one person as it does for a table of four.
Toss the lentils while they are still warm. Warm legumes drink up a vinaigrette far more readily than cold ones, so the Dijon-lemon dressing seasons them all the way through instead of just sliding off. Folding the arugula in at the very end lets the residual heat soften its raw edge to a gentle wilt while keeping its peppery bite intact, and the Dijon does double duty here, both sharpening the flavor and helping the oil and lemon juice hold together into a clingy dressing.
Nothing here is a garnish. The salmon brings rich, tender protein and omega-3 fats; the lentils add earthy heft and plenty of fiber that keeps you full; and the tomatoes, lemon, and arugula cut through it all with brightness so nothing feels heavy. It's the kind of meal that leaves you comfortably full rather than weighed down, and it tastes even better as the flavors meld while you eat.
Ingredients
- 4 salmon fillets (about 5 oz each)
- 2 1/2 cups cooked lentils
- 4 cups arugula
- 1 1/2 cups cherry tomatoes, halved
- 1/2 small red onion, thinly sliced
- 3 1/2 tbsp olive oil
- 2 tbsp fresh lemon juice
- 1 tbsp Dijon mustard
- 2 tbsp chopped dill
- 1/2 tsp salt
Instructions
- Start with cooked lentils, kept warm: This wants about two and a half cups of cooked lentils. From dry, rinse them and simmer 20 to 25 minutes, until tender but still holding their shape, then drain well and keep them warm. Warm lentils are the point of the whole dish, because they take up the dressing and they are what wilts the arugula later.
- Roast the salmon 10 to 12 minutes: Heat the oven to 425°F (220°C) and line a sheet pan with parchment. Pat the fillets dry, arrange them on the pan, and season with salt, then roast 10 to 12 minutes, until the flesh is opaque and flakes easily, or reads 125 to 130°F (52 to 54°C) at the thickest part, which is medium-rare. The FDA number for seafood is 145°F (63°C) if you prefer it fully opaque. Drying the surface first is what lets it firm rather than steam.
- Cut the vegetables while it roasts: While the salmon is in the oven, halve the cherry tomatoes, slice the red onion thin, and roughly chop the dill. Slice the onion as thin as you can, since raw red onion in thick pieces takes over every forkful, where thin slices spread the same sharpness across the whole bowl.
- Whisk the dressing in the serving bowl: Whisk the olive oil, lemon juice, Dijon, and salt together in a large bowl until it thickens slightly and looks smooth. The Dijon is doing the emulsifying, so whisk it with the lemon first and let the oil come in against it, and make it in the bowl you will toss in so nothing has to be poured over the top later.
- Toss the lentils warm, then fold in the arugula: Add the warm lentils, tomatoes, onion, and dill to the bowl and toss to coat, then fold in the arugula gently, just until it begins to wilt from the warmth of the lentils. That slight wilting is deliberate: it takes the raw edge off the leaves without collapsing them, and it happens in about fifteen seconds.
- Plate it warm, salmon on top: Divide the lentil salad among plates and set a salmon fillet on each. Serve right away while the salad is still warm, since this is built around warm lentils against cool greens and a plate that has stood for twenty minutes is a different, flatter dish.
Variations
- Swap the green: Trade the arugula for baby spinach or chopped kale if you prefer a milder or sturdier leaf. Kale will need a firmer toss with the warm lentils to soften.
- Change the protein: Roasted or pan-seared chicken thighs, or a piece of firm white fish like cod, stand in nicely for the salmon when you want a change.
- Herb it differently: Fresh parsley, mint, or chives can replace the dill for a different aromatic lift, or use a mix of a couple of them.
- Add a briny bite: Fold in a spoonful of capers, chopped olives, or crumbled feta for a saltier, tangier salad. Note that feta adds dairy.
- Make it heartier: Stir in a handful of cooked farro or a diced roasted sweet potato to stretch the salad into a fuller grain bowl. Farro adds gluten.
Storage & Leftovers
Store leftovers in an airtight container in the refrigerator for up to three days. Keep the salmon and lentil salad together or separate; both hold well, though the arugula will continue to soften over time.
The lentil salad is lovely cold or at room temperature straight from the fridge, so no reheating is needed there. If you'd rather warm the salmon, do it gently in a 275°F (135°C) oven for about 8 to 10 minutes until just heated through, which keeps it from drying out. A microwave works in a pinch but can toughen the fish, so use short bursts at reduced power.
To get ahead, cook the lentils and whisk the dressing up to three days in advance and keep them refrigerated separately. When you're ready to eat, roast the salmon fresh, warm the lentils, and toss everything with the dressing and arugula so the greens stay bright.
Notes & Tips
- Choose the right lentil: Green or brown lentils, or French lentils, hold their shape best and give the salad the pleasant bite you want. Red lentils turn mushy and won't work here.
- Buy salmon of even thickness: Ask for center-cut fillets of similar thickness so they roast in the same amount of time. Thinner tail pieces cook faster and can dry out.
- Judge doneness by feel: Salmon is done when it flakes with gentle pressure and looks just barely opaque in the center; it keeps cooking a little off the heat, so pull it a touch early if you're unsure.
- Tame the onion: If raw red onion is too sharp for you, soak the slices in cold water for ten minutes and drain before adding, which softens the bite while keeping the crunch.
- Balance the dressing to taste: Taste the dressing before tossing and adjust with more lemon juice for brightness or a little more olive oil if it's too tart for you.
- Serve it alongside bread: A slice of crusty bread or a warm pita is all this needs to round out the meal and mop up the last of the dressing.
Nutrition & Mindful Eating
- Salmon over lentils is the kind of pairing that eats like a full dinner on its own. The lentils give the plate its base and its earthiness, the fish gives it richness, and the lemon dressing keeps both from sitting heavy.
- Lentils hold their shape and stay slightly firm at the center, which is what keeps this from turning into a puree on the plate. They bring plant protein and a fiber that is mostly insoluble, giving the bowl real bulk.
- Arugula goes in while the lentils are still hot so it only half wilts, keeping its peppery bite in some leaves and losing it in others, and it carries a good amount of vitamin K along the way.
- Dijon mustard and lemon whisked into the olive oil make a dressing sharp enough to stand up to lentils, and pouring it on while everything is warm is what gets the flavor all the way into the middle of them.
- Raw red onion sliced thin sharpens the lentils from underneath, tomatoes burst into small pockets of acidity, and dill scattered at the end keeps the plate smelling fresh right up to the last bite.
- As you eat, let the peppery leaves and the earthy lentils meet in the same forkful, and stay at the table long enough to feel yourself arrive at comfortably full.
Frequently Asked Questions
Can I use canned lentils instead of cooking them from dry?
Yes. Drain and rinse them well, then warm them gently in a pan or in the microwave before tossing, since warm lentils soak up the dressing far better than cold ones.
How do I keep the salmon from drying out?
Roast it just until the flesh turns opaque and flakes with light pressure, around 10 to 12 minutes, and pull it a touch early since it keeps cooking off the heat. An instant-read thermometer showing 125 to 130°F (52 to 54°C) at the thickest part is your surest guide.
Can I serve this cold as a meal-prep lunch?
Absolutely. The lentil salad is delicious cold or at room temperature, and the salmon holds up well chilled, making this an easy make-ahead lunch to pack.
Why does the arugula go in last?
Adding it at the end lets the warmth of the lentils wilt it just slightly while keeping its fresh, peppery character. Tossed in too early, it would collapse and turn soggy.