Roasted Trout with Caramelized Onion and Lemon Butter
Prep
15 mins
Cook
35 mins
Servings
4
Difficulty
Easy
This is one of my favorite weeknight dinners because it comes together in just fifty minutes and tastes like you spent hours in the kitchen. Whole roasted trout is such an elegant dish, yet honestly quite simple to execute. The caramelized onions add incredible sweetness and depth, while the lemon butter sauce brightens everything up beautifully. Trout is wonderfully rich in omega 3 fatty acids, which are fantastic for your heart and brain health. Best of all, this meal feels fancy enough for company but uses humble ingredients you probably already have at home.
Ella x
Ingredients
- 4whole trout(cleaned and gutted, about 10 oz each)
- 3 largeyellow onions(thinly sliced)
- 4 tablespoonsbutter(divided)
- 2 tablespoonsolive oil
- 2fresh lemon(1 for zest, 1 for juice)
- 4 sprigsfresh thyme
- 3garlic cloves(minced)
- 1 teaspoonsea salt
- ½ teaspoonblack pepper
- 1 tablespoonbalsamic vinegar
- 1 teaspoonhoney
Detail level
Instructions
- 1
Preheat your oven to 400°F (200°C). Pat the trout dry inside and out with paper towels, then season the cavity and exterior with half the salt and pepper.
Tip: Drying the fish ensures better browning and crispier skin.
- 2
Heat 2 tablespoons of butter with olive oil in a large skillet over medium heat. Add the sliced onions and cook for 8-10 minutes, stirring occasionally, until softened and beginning to turn golden.
Tip: Medium heat prevents the onions from burning while they caramelize.
- 3
Stir in the minced garlic and cook for another 2 minutes until fragrant. Add the balsamic vinegar and honey, then continue cooking for 3-4 minutes until the onions are deeply caramelized and sticky. Season with remaining salt and pepper, then transfer to a small bowl.
Tip: The vinegar and honey add depth and complexity to the onion flavors.
- 4
Wipe out the skillet and place it over medium-high heat. Once hot, lay the trout skin-side down and sear for 2-3 minutes until the skin is crispy and golden brown.
Tip: Don't move the fish while searing to achieve maximum crispiness.
- 5
Transfer the skillet to the preheated oven and roast for 12-15 minutes until the flesh is opaque and flakes easily with a fork. The internal temperature should reach 145°F (63°C).
Tip: Cooking time depends on the size of your trout; check for doneness by gently flaking the thickest part.
- 6
While the trout finishes cooking, warm the remaining 2 tablespoons of butter in a small saucepan over low heat. Add the lemon zest and juice along with fresh thyme sprigs, stirring gently for 1-2 minutes until fragrant. Remove from heat.
Tip: Don't let the butter brown; keep the heat low to preserve the delicate lemon flavor.
- 7
Remove the trout from the oven and carefully transfer to serving plates. Divide the caramelized onions evenly among the four trout, spooning them onto the center of each fish.
Tip: Transfer with a wide spatula to keep the skin intact and the presentation beautiful.
- 8
Drizzle the warm lemon butter sauce around each fish and garnish with fresh thyme sprigs. Serve immediately while the trout is still warm and the skin is crispy.
Tip: Serve with roasted vegetables or a fresh green salad for a complete meal.
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