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Slow-Roasted Salmon with Fennel, Citrus, and Chillies

This slow-roasted salmon with fennel, citrus, and chillies is a vibrant and aromatic dish that celebrates fresh flavours. By cooking the fish gently in olive oil at a lower temperature, the salmon retains a beautifully buttery, melting texture that contrasts perfectly with the softened fennel and bright citrus slices. The addition of fresh chilli provides a subtle heat that cuts through the richness of the oil, making every bite balanced and sophisticated.

As a heart-healthy main course, this recipe is packed with omega-3 fatty acids and antioxidants from the fresh produce. It is an excellent choice for a light weekend lunch or a stress-free dinner party, as the gentle roasting method is very forgiving. Serve it in large flakes alongside some steamed seasonal greens or a crisp green salad for a complete, nourishing meal.

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Ingredients for Slow-Roasted Salmon with Fennel, Citrus, and Chillies

  • 1 medium fennel bulb, thinly sliced

  • 1 blood or navel orange, very thinly sliced, seeds removed

  • 1 Meyer or regular lemon, very thinly sliced, seeds removed

  • 1 red Fresno chilli or jalapeño, with seeds, thinly sliced

  • 4 sprigs dill, plus more for serving

  • Kosher salt, coarsely ground pepper

  • coarsely ground pepper

  • 1 (2-pound) skinless salmon fillet, preferably centre-cut

  • 180ml olive oil

  • Flaky sea salt (such as Maldon)

How to make Slow-Roasted Salmon with Fennel, Citrus, and Chillies

Preheat oven to 135°C. Toss fennel, orange slices, lemon slices, chilli, and 4 dill sprigs in a shallow 3-quart baking dish; season with kosher salt and pepper. Season salmon with kosher salt and place on top of fennel mixture. Pour oil over.

Roast until salmon is just cooked through (the tip of a knife will slide through easily and flesh will be slightly opaque), 30–40 minutes for medium-rare.

Transfer salmon to a platter, breaking it into large pieces as you go. Spoon fennel mixture and oil from baking dish over; discard dill sprigs. Season with sea salt and pepper and top with fresh dill sprigs.

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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