Skip to main content

Crispy fish with brown butter sauce and kohlrabi salad recipe

Crispy fish with brown butter sauce and kohlrabi salad is a heart-healthy dish that beautifully combines the delicate flavours of fish with a nutty, aromatic sauce. The skin-on Chilean sea bass or salmon fillets are pan-seared to perfection, creating a satisfying crunch that contrasts wonderfully with the refreshing kohlrabi and apple salad. Drizzled with a rich brown butter sauce, this meal not only delights the palate but also offers a wholesome dining experience, making it perfect for any occasion.

Ideal for a family dinner or a special weekend lunch, this recipe is both nutritious and easy to prepare. The addition of hazelnuts adds a delightful crunch, while the fresh lemon juice brightens the dish, ensuring a balanced meal that supports heart health. Serve it with a wedge of lemon for an extra zing and enjoy a satisfying, homemade feast that celebrates seasonal ingredients.

Continue reading below

Ingredients for Crispy fish with brown butter sauce and kohlrabi salad

  • 5 ml honey

  • 60–65 ml fresh lemon juice

  • 45 ml extra-virgin olive oil, divided

  • 5 ml kosher salt, plus more

  • 2 small kohlrabi, peeled, halved lengthwise, thinly sliced crosswise

  • 1 large green apple, cut into quarters lengthwise, thinly sliced lengthwise

  • 75 g red onion, thinly sliced

  • 450–170 g skin-on Chilean sea bass or salmon fillets

  • freshly ground black pepper

  • 75 g coarsely chopped blanched hazelnuts

  • 85 g unsalted butter, cut into pieces

  • lemon wedges (for serving)

How to make Crispy fish with brown butter sauce and kohlrabi salad

  1. Whisk together 60 ml of honey, 60 ml of lemon juice, 30 ml of oil, and 1 tsp of salt in a large bowl. Add the kohlrabi, apple, and onion, then toss to coat. Set aside to marinate while you prepare the fish.

  2. Swirl the remaining 15 ml of oil in a large non-stick frying pan to coat. Season the fish generously on both sides with salt and pepper, then place the fish skin side down in the cold frying pan. Set the heat to medium and cook until the fat starts to render from the fish, about 4 minutes. Gently press on the fillets with a spatula to ensure the skin makes good contact with the pan, alternating between fillets every few seconds until the skin begins to crisp. Continue cooking without pressing until the skin is very crisp and the flesh is mostly opaque, about 8–10 minutes total (adjust the heat as necessary; do not rush this step). Carefully turn the fish over and cook until completely opaque, about 1 minute. Transfer to plates, skin side up.

  3. Wipe out the frying pan and return it to medium heat. Add the hazelnuts and butter, swirling the pan often, and cook until the butter foams and then turns golden brown, about 4 minutes. Remove from heat and stir in the remaining 10 ml of lemon juice; season the brown butter sauce with salt and pepper.

  4. Toss the kohlrabi salad and serve alongside the fish fillets, discarding any excess dressing. Spoon the brown butter sauce over the fish and salad, and serve with lemon wedges for squeezing over.

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.

Continue reading below

Article history

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

  • 6 Oct 2025 | 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.