Skip to main content

Halibut with Spring Onion and Summer Squash Saute

This elegant pan-seared halibut with spring onion and summer squash sauté is a perfect example of how seasonal ingredients can create a sophisticated, nutritious meal. The lean, flaky texture of the halibut pairs beautifully with the natural sweetness of the caramelised onions and tender squash. By using fresh thyme and a light touch of olive oil, this dish delivers a wonderful depth of savoury flavour without the need for heavy sauces or butter, making it a light yet satisfying choice for a warm evening.

As a diabetes-friendly main course, this recipe prioritises high-quality protein and a variety of non-starchy vegetables to provide a balanced and heart-healthy dinner. The combination of vibrant colours and textures makes it suitable for both a quick midweek supper and a more formal weekend gathering. Serve it exactly as it is for a low-carb option, or accompany it with a side of steamed new potatoes or a crisp green salad.

Continue reading below

Ingredients for Halibut with Spring Onion and Summer Squash Saute

  • 8 spring onions or large spring onions, bulbs separated from tops

  • 60ml (or more) olive oil, divided

  • 675g assorted summer squash, cut into 1" pieces

  • 1 tablespoon thyme leaves plus 4 sprigs

  • Kosher salt and freshly ground black pepper

  • 110g skinless halibut fillets

How to make Halibut with Spring Onion and Summer Squash Saute

Cut onion bulbs in half lengthwise (quarter if large). Cut enough onion tops into 2" lengths to measure 240ml . Heat 1 tablespoon oil in a large skillet over medium-high heat until almost smoking. Add onion bulbs, cut side down; cook until golden, about 3 minutes. Transfer to a plate.

Heat 1 tablespoon oil in same skillet. Add squash; cook, stirring occasionally, until golden brown and just tender, about 5 minutes. Stir in onion bulbs, 1 cup onion tops, and 1 tablespoon thyme leaves; season with salt and pepper and cook until onion tops wilt, about 1 minute longer. Remove from heat; set squash mixture aside.

Heat remaining 2 tablespoons oil in a large nonstick or cast-iron skillet over medium-high heat. Season halibut with salt. Add fish and thyme sprigs to skillet and cook until fish is golden brown, about 5 minutes. Turn fish and cook until just cooked through and opaque in the centre, about 2 minutes longer. Divide onion-squash sauté among plates; top with halibut.

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
flu eligibility checker

Ask, share, connect.

Browse discussions, ask questions, and share experiences across hundreds of health topics.

symptom checker

Feeling unwell?

Assess your symptoms online for free

Sign up to the Patient newsletter

Your weekly dose of clear, trustworthy health advice - written to help you feel informed, confident and in control.

Please enter a valid email address

By subscribing you accept our Privacy Policy. You can unsubscribe at any time. We never sell your data.