Roasted Halibut with Caramelized Onion and Thyme
Prep
20 mins
Cook
35 mins
Servings
4
Difficulty
Easy
This is one of my favorite weeknight dinners because it comes together in just over an hour with minimal fuss. Halibut is naturally lean and packed with omega 3 fatty acids, making it as nutritious as it is delicious. The magic happens when you caramelize those onions until they're golden and sweet, then nestle the delicate fish fillets on top with fresh thyme and garlic. The whole thing roasts together beautifully, creating a simple yet elegant meal that tastes like you spent way more time in the kitchen than you actually did. It's affordable, straightforward, and honestly, it never fails to impress.
Ella x
Ingredients
- 4halibut fillets(6 oz each, patted dry)
- 2 largeyellow onions(thinly sliced)
- 4 tablespoonsolive oil
- 3 sprigsfresh thyme
- 3garlic cloves(minced)
- 2 tablespoonsbutter
- 1lemon(zest and juice)
- 237 mlwhite wine
- 1 teaspoonsea salt
- 1 teaspoonblack pepper
- 237 mlvegetable broth
Detail level
Instructions
- 1
Preheat oven to 400°F. Heat 2 tablespoons of olive oil in a large skillet over medium heat and add the sliced onions with a pinch of salt. Cook for 15-18 minutes, stirring occasionally, until the onions are deeply golden and caramelized.
Tip: Don't rush the caramelization—low and slow heat brings out the natural sweetness of the onions.
- 2
When onions are nearly done, add minced garlic and fresh thyme sprigs, cooking for another 2 minutes until fragrant.
- 3
Transfer the caramelized onion mixture to a baking dish, spreading it evenly across the bottom. Deglaze the skillet with white wine and vegetable broth, scraping up any browned bits, then pour over the onions.
Tip: The deglazing liquid adds depth and keeps the halibut moist during roasting.
- 4
Pat the halibut fillets completely dry and season both sides generously with sea salt and black pepper.
Tip: Drying the fish ensures a better texture and helps it cook evenly.
- 5
Heat the remaining 2 tablespoons of olive oil in the skillet over medium-high heat. Sear the halibut fillets skin-side up for 2-3 minutes until golden, then carefully transfer them to the baking dish, nestling them into the onions.
- 6
Roast in the preheated oven for 12-15 minutes until the halibut is opaque and flakes easily with a fork.
Tip: Halibut cooks quickly, so check for doneness at the 12-minute mark to avoid overcooking.
- 7
Remove from oven and top each fillet with a small knob of butter, lemon zest, and a squeeze of fresh lemon juice. Serve immediately with the caramelized onions spooned around each fillet.
Tip: The butter and lemon create a silky sauce that enhances the delicate fish.
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