Roasted Sea Bass with Leek and Lemon Beurre Blanc
Prep
20 mins
Cook
25 mins
Servings
4
Difficulty
Medium
This elegant roasted sea bass with leek and lemon beurre blanc comes together in under an hour, making it perfect for weeknight dinners when you want something that tastes restaurant quality without the fuss. Sea bass is wonderfully lean and packed with omega 3 fatty acids that are fantastic for your heart, and honestly, the mild, delicate flavor pairs beautifully with the silky butter sauce and tender leeks. What I love most about this dish is how straightforward it is to pull off at home, even if you're not particularly experienced in the kitchen. The fish roasts while you prepare the beurre blanc, so everything comes together naturally without complicated timing. It's simple, nourishing, and impressive enough to serve guests.
Ella x
Ingredients
- 4sea bass fillets(6 oz each, skin-on)
- 3 mediumleeks(white and light green parts only, halved lengthwise and sliced into 2-inch pieces)
- 6 tablespoonsunsalted butter(divided)
- 118 mldry white wine
- 3 tablespoonsfresh lemon juice
- 2shallots(minced)
- 59 mlfish stock
- 4fresh thyme sprigs
- 1 teaspoonsea salt
- ½ teaspoonground black pepper
- 2 tablespoonsolive oil
- 2garlic cloves(minced)
- 8lemon slices(for garnish)
Detail level
Instructions
- 1
Preheat oven to 400°F. Heat 2 tablespoons butter with olive oil in a large skillet over medium heat. Add leeks and cook for 8-10 minutes, stirring occasionally, until golden and softened. Season with salt and pepper, then transfer to a roasting pan and arrange in a single layer. Set aside.
Tip: Leeks benefit from patient cooking—resist the urge to stir too frequently to allow proper caramelization.
- 2
Pat sea bass fillets dry with paper towels and season both sides generously with salt and pepper. Nestle the fillets skin-side up over the roasted leeks. Dot each fillet with a small piece of butter and top with a sprig of thyme.
Tip: Drying the fish ensures the skin crisps up nicely during roasting.
- 3
Roast in the preheated oven for 12-15 minutes until the fish is cooked through and flakes easily with a fork. The internal temperature should reach 145°F.
Tip: Don't overcook the delicate fish—check it a minute or two early to avoid dryness.
- 4
While the fish roasts, prepare the beurre blanc sauce. In a small saucepan, combine white wine, minced shallots, and fish stock. Bring to a simmer over medium heat and reduce until only 3 tablespoons of liquid remain, approximately 5-6 minutes.
Tip: A proper reduction concentrates the flavors and creates the base for a silky sauce.
- 5
Remove from heat and whisk in the remaining 4 tablespoons of butter, one tablespoon at a time, until fully incorporated and the sauce is glossy. Stir in fresh lemon juice and minced garlic. Taste and adjust seasoning with salt and pepper as needed.
Tip: Keep the heat low when whisking in butter to prevent the sauce from breaking or becoming greasy.
- 6
Divide the leeks among four serving plates. Place one roasted sea bass fillet on top of each portion. Spoon the warm lemon beurre blanc sauce around the fish and garnish with fresh lemon slices and any remaining thyme sprigs. Serve immediately.
Tip: Plate this dish just before serving to keep the fish warm and the sauce at the perfect temperature.
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