Salmon Spaghetti with Lemon Garlic Sauce
Bright, comforting, and ready in the time it takes water to boil, this Salmon Spaghetti with Lemon Garlic Sauce is a weeknight winner that feels special enough for guests. Think tender chunks of salmon, toasted walnuts for crunch, briny capers, a squeeze of fresh lemon and a glossy olive oil–butter emulsion that coats every strand of spaghetti. There’s parmesan folded in for savory depth and crisp sourdough croutons that add a satisfying contrast to the silky pasta. This recipe balances freshness and richness in a way that’s approachable for any cook.
Why you’ll love this recipe
This Salmon Spaghetti with Lemon Garlic Sauce checks a lot of boxes: it’s quick, uses simple pantry ingredients, and delivers complex flavor without fuss. The lemon and garlic brighten the salmon, while the toasted walnuts add toasty notes and texture. Watercress brings a peppery lift that cuts through the richness, and capers give small pops of salt and tang. It’s elegant enough for guests and relaxed enough for a clutter-free weeknight dinner.
Ingredients
- ▢2 lemons, squeeze out lemon juice and zest
- ▢1 clove garlic, minced
- ▢2 ounces toasted walnuts
- ▢1/3 cup grated parmesan cheese
- ▢13 ounces spaghetti
- ▢1/3 cup olive oil
- ▢2 tablespoons baby capers
- ▢2 slices sourdough bread, cut into bite-sized cubes
- ▢1 pound skinless salmon fillets, cut into 1-inch thick bite-sized pieces, season with salt and ground black pepper
- ▢2 3/4 tablespoons unsalted butter
- ▢2 ounces watercress leaves
Prep notes
Make sure the salmon is cut into roughly 1-inch pieces so it cooks quickly and evenly. Toast the walnuts until fragrant—this takes just a few minutes in a dry skillet. If your lemons are large, start with the juice and zest from two; you can always add a touch more if you want extra brightness. Grate the parmesan fresh for the best flavor and texture.
Equipment
- Large pot for boiling pasta
- Skillet for toasting walnuts and cooking salmon
- Small skillet or pan for making sourdough croutons
- Large bowl for combining sauce and pasta
- Tongs or pasta fork
- Microplane or zester
Step-by-step instructions
Below is a clarified, step-by-step version of the original directions, rewritten to be straightforward while preserving the ingredient amounts and the order of operations. Follow these steps in sequence for the best result.
- Bring the pasta water to a boil. Fill a large pot with water and bring it to a rolling boil over high heat. Generously salt the water—this is the primary seasoning for the spaghetti.
- Prepare the lemons and garlic. While the water heats, zest and juice the 2 lemons, keeping the juice and zest separate. Mince the 1 clove of garlic and set aside.
- Toast the walnuts. Place the 2 ounces of walnuts in a dry skillet over medium heat. Toast, shaking the pan occasionally, until they are fragrant and just beginning to color, about 3–5 minutes. Remove from heat and roughly chop if you prefer smaller pieces.
- Toast the sourdough croutons. In a small skillet, heat a tablespoon of olive oil over medium heat. Add the 2 slices of sourdough bread cut into bite-sized cubes and cook, stirring often, until the cubes are golden and crisp on all sides. Transfer to a paper towel-lined plate and season lightly with salt while hot.
- Cook the spaghetti. Once the water is boiling, add the 13 ounces of spaghetti and cook according to the package directions until al dente. Reserve about 1 cup of the pasta cooking water before draining.
- Start the lemon-garlic sauce. While the pasta cooks, heat a large skillet over medium-low heat and add the 1/3 cup olive oil. Stir in the minced garlic and cook gently until fragrant but not browned, about 30–45 seconds. Add the lemon juice and lemon zest to the oil-garlic mixture, stirring to combine.
- Cook the salmon pieces. Increase the skillet heat to medium. Add the seasoned 1 pound of skinless salmon fillets cut into 1-inch pieces to the skillet in a single layer if possible. Cook, turning gently as needed, until the salmon is opaque and cooked through but still tender—about 3–4 minutes depending on thickness. Remove the salmon from the skillet and set aside on a plate. Keep any cooking juices in the pan; they’ll add flavor to the sauce.
- Finish the sauce with butter and capers. Reduce the heat to low and return any juices to the pan if you removed them. Add the 2 3/4 tablespoons unsalted butter to the lemon-garlic-oil mixture and stir until the butter melts and the sauce becomes glossy. Stir in the 2 tablespoons baby capers and let them warm through for a minute.
- Combine pasta and sauce. Add the drained spaghetti to the skillet with the sauce. Toss gently to coat the pasta, adding reserved pasta water a few tablespoons at a time as needed to loosen the sauce and help it cling to the noodles. Aim for a silky, emulsified sauce that lightly coats each strand.
- Add parmesan, walnuts, and salmon. Stir in the 1/3 cup grated parmesan cheese and the toasted walnuts, tossing until everything is evenly distributed. Gently fold the cooked salmon pieces back into the pasta, taking care not to break them up too much.
- Toss in the watercress and finish. Add the 2 ounces of watercress leaves to the skillet and toss for just a few seconds—enough to wilt the leaves slightly but retain their peppery freshness. Taste and adjust seasoning with salt and ground black pepper as needed.
- Plate and garnish. Serve the Salmon Spaghetti with Lemon Garlic Sauce immediately, scattering the sourdough croutons on top for crunch. If you like, add an extra sprinkle of grated parmesan and a twist of lemon zest for brightness.
Troubleshooting & tips
- Sauce too thick? Add reserved pasta water a tablespoon at a time until you reach the desired consistency. The starch in the water helps bind the sauce.
- Overcooked salmon? Cut the salmon into uniform 1-inch pieces so it cooks evenly. Remove it from the pan as soon as it is opaque throughout.
- Want more texture? Pulse half the toasted walnuts for a finer crumb and leave the rest roughly chopped for contrast.
- Make-ahead: You can toast walnuts and make the croutons a day ahead. Reheat them briefly before serving to refresh their crunch.
Serving suggestions
This Salmon Spaghetti with Lemon Garlic Sauce pairs beautifully with a crisp green salad dressed simply with lemon and olive oil. A side of steamed asparagus or roasted cherry tomatoes would complement the citrus and add color to the plate. For wine, choose a chilled white with bright acidity—think Sauvignon Blanc or Pinot Grigio—to mirror the lemon notes and cut through the butter and oil.
Storage
Store leftovers in an airtight container in the refrigerator for up to 2 days. The pasta will absorb sauce over time; when reheating, add a splash of water or olive oil to loosen it. Gently reheat on the stovetop over low heat or in the microwave in short bursts to avoid overcooking the salmon. The croutons will soften—make them fresh if you want retained crunch.
Variations
- Herby version: Add a handful of chopped fresh parsley or basil when folding in the watercress for extra herbaceousness.
- Nut swap: Substitute toasted pine nuts or almonds if you prefer; keep the 2 ounces measurement.
- Spicy kick: Toss in a pinch of red pepper flakes to the garlic-and-oil step for warmth.
- Make it creamy: Stir in a couple of tablespoons of cream or crème fraîche when adding butter for a richer sauce, though the original olive oil + butter emulsion is bright and light.
Final thoughts
This Salmon Spaghetti with Lemon Garlic Sauce is the sort of recipe that becomes a repeat favorite. It feels like a treat, but it’s unpretentious to make—no long list of steps, no complicated sauce technique. The lemon and garlic sing, the salmon adds substance, and the walnuts and croutons bring texture contrasts that make every bite interesting. Keep the components simple, follow the step-by-step instructions above, and you’ll have a deceptively elegant dish on the table in under 30 minutes.
Salmon Spaghetti with Lemon Garlic Sauce
Ingredients
Equipment
Method
- Make the lemon-garlic sauce: in a blender combine lemon zest and juice, minced garlic, and toasted walnuts; blend on high until smooth, about 30 seconds.
- Add the grated Parmesan and 3 tablespoons of olive oil to the blender and blend until well combined; transfer the sauce to a small bowl and set aside.
- Cook the spaghetti in a large pot of salted boiling water until al dente according to package directions; reserve 1 cup of the pasta cooking water, then drain the pasta.
- Heat 1 tablespoon olive oil in a skillet over medium-high heat, add the baby capers and cook until crisp, about 3 minutes; transfer to a paper towel–lined plate to drain.
- In the same skillet, add the remaining olive oil and reduce heat to medium; add the sourdough cubes and cook, stirring occasionally, until golden and crisp, 2–3 minutes; transfer to the plate with the capers.
- Pat the salmon pieces dry and season with salt and black pepper. Melt the butter in the skillet over medium-high heat, add the salmon, and cook until just cooked through and fork-tender, 3–5 minutes; remove from the skillet and set aside.
- Add the prepared sauce, drained spaghetti, and up to 1 cup reserved pasta water to the skillet; cook briefly over medium heat while tossing with tongs until the pasta is evenly coated and sauce is silky, adding more pasta water as needed.
- Stir in the cooked salmon and watercress gently to combine and warm the watercress slightly without wilting it completely.
- Serve the pasta topped with the crispy capers and toasted sourdough cubes and additional watercress if desired.
Notes
- Use fresh wild-caught salmon for best flavor.
- Defrost frozen salmon completely before cooking.
- Do not overcook the salmon; remove when opaque and fork-tender.
- You can cook the salmon whole or cut into pieces to reduce cooking time.
- Adjust lemon juice in the sauce to taste if you prefer less sourness.
