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Halibut Confit With Leeks, Coriander, and Lemon

This elegant halibut confit with leeks, coriander and lemon is a wonderfully light way to enjoy white fish. By slowly poaching the halibut in a coriander-infused olive oil, the flesh remains remarkably moist and tender, absorbing the bright notes of citrus and the earthy warmth of the toasted spice. It is a sophisticated yet simple one-pan dish that celebrates clean flavours and gentle cooking techniques.

As a diabetes-friendly main course, this recipe prioritises healthy fats and high-quality protein without sacrificing depth of flavour. The softened leeks provide a subtle sweetness that pairs perfectly with the flaky fish, making it a nutritious choice for a midweek dinner or a relaxed weekend lunch. Serve it just as it is, or with a side of steamed seasonal greens for a complete, heart-healthy meal.

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Ingredients for Halibut Confit With Leeks, Coriander, and Lemon

  • 1 tablespoon coriander seeds, plus more very coarsely chopped for serving

  • 4 leeks, white and pale-green parts only, halved lengthwise, cut crosswise into 2" pieces

  • 8 sprigs coriander, cut into 2" pieces, plus leaves for serving

  • 1 cup olive oil

  • 1 lemon, thinly sliced, seeds removed

  • Kosher salt

  • 450g skinless halibut fillet, halved lengthwise

How to make Halibut Confit With Leeks, Coriander, and Lemon

Preheat oven to 191°C. Coarsely grind 1 tablespoon coriander seeds in a spice mill or with a mortar and pestle. (Alternatively, you can coarsely chop with a knife.)

Toss leeks, coriander sprigs, oil, half of lemon slices, and 2 teaspoons ground coriander in a large roasting pan; season with salt. Roast, tossing occasionally, until leeks are tender and starting to brown, 15-20 minutes. Remove roasting pan from oven and carefully pour infused oil into a large heatproof measuring cup.

Reduce oven temperature to 135°C. Season halibut with salt and arrange over leeks in roasting pan. Top with remaining lemon slices and ground coriander and pour infused oil over fish. Roast until halibut is just cooked through and starting to flake, 30-35 minutes.

Cut halibut into large pieces and serve with leeks and lemon topped with chopped coriander seeds and coriander leaves.

Do ahead: Halibut can be roasted 1 hour ahead. Let cool and cover.

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.

  • 16 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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