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Poached Cod With Potatoes and Leeks

This elegant poached cod with potatoes and leeks is a wonderful example of a simple, dairy-free main course that doesn't compromise on flavour. By poaching the white fish in a fragrant bath of milk infused with garlic and fresh thyme, the cod remains incredibly moist and takes on a delicate, aromatic character. The addition of softened leeks provides a subtle sweetness that perfectly complements the flaky texture of the fish.

Served alongside lightly smashed potatoes finished with olive oil, this nutritious recipe is ideal for a comforting mid-week meal or a relaxed weekend lunch. High in protein and naturally low in saturated fats, it is a brilliant way to enjoy fresh seafood. For a final touch, a simple drizzle of extra virgin olive oil and a crack of black pepper brings all the components together beautifully.

Continue reading below

Ingredients for Poached Cod With Potatoes and Leeks

  • 675g small Yukon Gold potatoes

  • Kosher salt

  • 2 tablespoons olive oil, plus more for drizzling

  • 2 medium leeks, white and pale-greens parts only, halved lengthwise, with some root attached

  • 4 sprigs thyme

  • 2 garlic cloves, smashed

  • 725ml whole milk

  • 4 (170g) skinless cod fillets

  • Freshly ground black pepper

How to make Poached Cod With Potatoes and Leeks

Place potatoes in a medium pot and add cold water to cover by 1"; season with salt and bring to a boil. Reduce heat and simmer until fork-tender, 15–20 minutes. Drain, reserving 60ml cooking liquid. Return potatoes to pot; add 2 tablespoons cooking liquid and 2 tablespoons oil and lightly mash. Season with salt. Keep potatoes warm over low heat until ready to serve.

Combine leeks, thyme, garlic, and milk in a medium wide saucepan. Season generously with salt and bring to a simmer over medium heat. Cook until leeks are just beginning to soften, 6–8 minutes. Gently slide cod into infused milk and poach until flesh is cooked through and beginning to flake, 7–9 minutes (adjust heat as needed to maintain a low simmer; thicker pieces of fish will take longer to cook).

Divide warm potatoes, leeks, and cod among shallow bowls. Spoon some poaching liquid over each. Drizzle with oil; season with pepper.

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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