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Salmon with Lentils and Mustard-Herb Butter (Saumon aux Lentilles)

This elegant pan-fried salmon with lentils and herb butter is a wonderful example of a heart-healthy meal that does not compromise on flavour. The dish pairs succulent, golden salmon fillets with earthy French green lentils and sweet, softened leeks. A homemade mustard and tarragon butter melts over the warm fish, creating a silky sauce that ties the elements together beautifully while adding a sophisticated French-inspired touch to your dinner table.

Perfect for a nutritious midweek supper or a casual weekend dinner party, this recipe is packed with omega-3 fatty acids and plant-based fibre. The combination of protein-rich salmon and slow-release carbohydrates from the lentils makes it a satisfying and balanced choice. Serve alongside some steamed seasonal greens or a crisp watercress salad for a complete, wholesome meal.

Continue reading below

Ingredients for Salmon with Lentils and Mustard-Herb Butter (Saumon aux Lentilles)

  • 5 tablespoons unsalted butter, softened

  • 1 tablespoon chopped chives

  • 1 teaspoon chopped tarragon

  • 2 teaspoons grainy mustard

  • 2 teaspoons fresh lemon juice

  • 240ml French green lentils

  • 950ml water

  • 2 medium leeks (white and pale green parts only)

  • 1 tablespoon unsalted butter

  • 1/2 to 1 tablespoon fresh lemon juice

  • 4 (170g) pieces skinless salmon fillet

  • 2 tablespoons unsalted butter

How to make Salmon with Lentils and Mustard-Herb Butter (Saumon aux Lentilles)

Stir together all ingredients with 1/4 teaspoons each of salt and pepper.

Bring lentils, water, and 3/4 teaspoons salt to a boil in a heavy medium saucepan, then reduce heat and simmer, uncovered, until lentils are just tender, 20 to 25 minutes. Remove from heat and let stand 5 minutes. Reserve 120ml cooking liquid, then drain lentils.

While lentils cook, chop leeks, then wash . Cook leeks in butter in a heavy medium skillet over medium-low heat, stirring occasionally, until softened, 6 to 8 minutes.

Add lentils with reserved cooking liquid to leeks along with 45ml mustard-herb butter and cook, stirring, until lentils are heated through and butter is melted. Add lemon juice and salt and pepper to taste. Remove from heat and keep warm, covered.

Pat salmon dry and sprinkle with 1/2 teaspoons salt and 1/4 teaspoons pepper (total).

Heat butter in a large nonstick skillet over medium-high heat until foam subsides, then sauté salmon, turning once, until golden and just cooked through, 6 to 8 minutes total.

Serve salmon, topped with remaining mustard-herb butter, over lentils.

Disclaimer

While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.

Article history

The information on this page is peer reviewed by qualified clinicians.

  • 17 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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