This Crispy Sea Bass with Roasted Fennel and Orange Brown Butter is an elegant Mediterranean-inspired seafood dish featuring tender, flaky sea bass with golden skin, sweet roasted fennel, caramelized red onion, and fresh orange.
The fish is roasted over aromatic vegetables with thyme, orange zest, and white wine, then finished with a luxurious brown butter sauce made with shallots, capers, orange juice, lemon, and fresh parsley.
The combination of crispy fish skin, delicate seafood, sweet citrus, and nutty brown butter creates a restaurant-style dinner that’s surprisingly simple to prepare at home.
Whether you’re planning a special dinner, entertaining guests, or looking for a flavorful new way to cook sea bass, this recipe delivers beautiful presentation and delicious results.
Prep Time
15 minutes
Cook Time
20–25 minutes
Total Time
About 40 minutes
Servings
4
Why You’ll Love This Crispy Sea Bass Recipe
Sea bass is known for its mild, delicate flavor and tender white flesh. When cooked with the skin on, it develops a beautiful contrast between the crisp exterior and moist interior.
Roasted fennel adds a subtle anise-like sweetness, while red onion and orange slices become tender and aromatic in the oven.
The orange brown butter sauce is what makes this recipe particularly special. Browning butter creates a rich, nutty aroma, while fresh citrus juice and capers add brightness and balance.
This dish feels elegant enough for a restaurant menu but uses straightforward cooking techniques and readily available ingredients.
Ingredients
For the Sea Bass and Roasted Vegetables
4 skin-on sea bass fillets, approximately 150 g each
2 fennel bulbs, cut into wedges
1 small red onion, thinly sliced
1 orange, thinly sliced
2 tablespoons olive oil
¾ teaspoon salt
½ teaspoon freshly ground black pepper
½ teaspoon crushed fennel seeds
1 teaspoon fresh orange zest
4 fresh thyme sprigs
80 ml dry white wine
For the Orange Brown Butter Sauce
60 g unsalted butter
1 small shallot, finely minced
1 tablespoon capers, drained
3 tablespoons fresh orange juice
1 tablespoon fresh lemon juice
1 tablespoon chopped fresh parsley
Freshly ground black pepper, to taste
Optional Garnishes
Fresh fennel fronds
Additional orange zest
Extra capers
Fresh thyme leaves
How to Make Crispy Sea Bass with Roasted Fennel and Orange Brown Butter
1. Preheat the oven. Preheat your oven to 220°C (425°F). Prepare a shallow baking dish large enough to hold the vegetables and sea bass fillets in a single layer.
2. Prepare the vegetables. Arrange the fennel wedges, sliced red onion, and thin orange slices evenly across the bottom of the baking dish.
3. Season the vegetables. Drizzle with olive oil, using some for the fish, and sprinkle with approximately half the salt and a little freshly ground black pepper. Toss gently to coat.
4. Prepare the sea bass. Pat the sea bass fillets thoroughly dry with paper towels, especially the skin. This helps encourage a better texture during roasting.
5. Season the fish. Brush the flesh side lightly with olive oil. Season with the remaining salt, black pepper, crushed fennel seeds, and fresh orange zest.
6. Arrange the fillets. Place the sea bass fillets skin-side up over the vegetables, leaving a little space between each piece.
7. Add the aromatics. Place the fresh thyme sprigs around the fish. Carefully pour the dry white wine into the bottom of the baking dish, keeping the liquid away from the fish skin.
8. Roast the sea bass. Transfer the baking dish to the oven and roast for 14–18 minutes, depending on the thickness of the fillets. The fish should become opaque and flake easily in the center.
9. Rest the fish. Remove the baking dish from the oven and allow the sea bass to rest for approximately 3 minutes.
10. Brown the butter. While the fish cooks, melt the unsalted butter in a small, light-colored saucepan over medium heat. Continue cooking until the butter foams, the milk solids turn golden brown, and a nutty aroma develops.
11. Add shallot and capers. Reduce the heat slightly and add the finely minced shallot and drained capers. Cook for approximately 1 minute, stirring gently.
12. Add the citrus juices. Carefully pour in the fresh orange juice and lemon juice. Allow the sauce to simmer gently for 1–2 minutes.
13. Finish the sauce. Remove the saucepan from the heat and stir in the chopped parsley. Season with freshly ground black pepper to taste.
14. Plate the vegetables. Divide the roasted fennel, red onion, and orange slices among four serving plates.
15. Add the sea bass. Carefully place a sea bass fillet over the vegetables, keeping the skin facing upward.
16. Finish and serve. Spoon the warm orange-caper brown butter sauce around the fish. Garnish with fennel fronds, additional orange zest, and extra capers. Serve immediately.
Tips for Perfect Crispy Sea Bass
Dry the skin thoroughly. Excess moisture prevents fish skin from crisping properly. Patting the fillets dry before cooking is an important first step.
Keep the cooking liquid away from the skin. Pour the wine into the bottom of the dish rather than directly over the fish.
Avoid overcrowding. Arrange the fillets with a little space between them to encourage more even cooking.
Check the fish carefully. Sea bass cooks relatively quickly and can become dry if overcooked. For food safety, fish should reach an internal temperature of 145°F (63°C).
For extra-crispy skin, use a skillet. Oven-roasting over moist vegetables may leave the skin only lightly crisp. For a more pronounced crispy texture, briefly sear the skin side in a hot skillet with a little oil before finishing the fish in the oven.
How to Make Perfect Orange Brown Butter Sauce
Brown butter, also known as beurre noisette, is made by gently cooking butter until its milk solids turn golden brown and develop a toasted, nutty aroma.
The process transforms ordinary melted butter into a deeply flavorful sauce base.
When combined with sweet orange juice, bright lemon juice, savory shallots, and salty capers, the brown butter becomes a beautifully balanced sauce for seafood.
Use a light-colored saucepan so you can clearly see the butter changing color.
Once the butter becomes golden brown, reduce the heat to prevent burning.
For the best presentation, spoon the sauce around the fish rather than directly over the crispy skin.
Why Fennel and Orange Work So Well with Sea Bass
Fennel has a naturally sweet, slightly licorice-like flavor that becomes milder and more delicate when roasted.
Orange adds citrus sweetness and acidity, balancing the richness of the fish and butter sauce.
Together, these ingredients create a classic Mediterranean-inspired flavor combination.
The roasted red onion adds another layer of sweetness, while thyme and crushed fennel seeds provide aromatic depth.
Can I Make This Recipe Without White Wine?
Yes. Replace the dry white wine with an equal amount of fish stock or vegetable stock.
The roasted vegetables and orange brown butter sauce will still provide plenty of flavor.
For a slightly brighter finish, add a small splash of fresh lemon juice to the cooking liquid.
Can I Use Another Type of Fish?
Absolutely. This recipe also works well with other firm white fish varieties, including:
Sea bream
Snapper
Halibut
Cod
Haddock
Choose skin-on fillets when possible if you want a crispy exterior.
Cooking times may need to be adjusted according to the thickness of the fish.
What to Serve with Crispy Sea Bass
This elegant seafood dish pairs beautifully with simple side dishes that complement its citrus and herb flavors.
Roasted baby potatoes
Creamy mashed potatoes
Steamed jasmine rice
Lemon herb couscous
Garlic sautéed green beans
Roasted asparagus
Mediterranean vegetable salad
Warm crusty bread
For a complete Mediterranean-inspired dinner, serve the sea bass with roasted potatoes and a fresh green salad.
Can I Prepare This Recipe Ahead of Time?
You can slice the fennel, red onion, and orange ahead of time and store them in the refrigerator.
The sea bass can also be portioned and the seasonings measured in advance.
For the best texture, cook the fish shortly before serving.
Brown butter sauce is best freshly prepared, although you can measure the ingredients ahead of time to make the final cooking process easier.
How to Store Leftovers
Allow leftover sea bass and vegetables to cool slightly before transferring them to an airtight container.
Refrigerate for up to 2 days.
Store the brown butter sauce separately if possible.
To reheat, place the fish in a covered baking dish and warm gently until heated through.
Avoid overheating because sea bass can become dry and lose its delicate texture.
The skin may soften during storage and reheating.
Frequently Asked Questions
How do I know when sea bass is cooked?
Sea bass is ready when the flesh becomes opaque and separates easily into flakes. The recommended safe internal temperature is 145°F (63°C).
Can I eat sea bass skin?
Yes. Sea bass skin is edible and can be delicious when properly cooked until crisp.
Why isn’t my sea bass skin crispy?
Excess moisture, overcrowding, or contact with cooking liquid can prevent the skin from crisping. Dry the skin thoroughly and consider a quick skin-side sear for extra crunch.
Can I make the brown butter sauce without capers?
Yes. Simply omit the capers. The sauce will still have a delicious combination of nutty butter, citrus, shallot, and fresh herbs.
Can I use bottled orange juice?
Freshly squeezed orange juice is recommended because it provides a brighter, fresher flavor.
Can I roast the fennel before adding the fish?
Yes. If you prefer very tender, caramelized fennel, roast the vegetables for approximately 10–15 minutes before adding the sea bass. Then continue cooking until the fish is done.
Final Thoughts
Crispy Sea Bass with Roasted Fennel and Orange Brown Butter is a beautiful seafood recipe that combines delicate white fish, aromatic roasted vegetables, fresh citrus, and a rich, nutty butter sauce.
The contrast between tender fish, lightly crisp skin, sweet fennel, and bright orange-caper sauce makes this dish both comforting and elegant.
Whether you’re preparing a special dinner or simply want to try a new way to cook sea bass, this flavorful Mediterranean-inspired recipe is an excellent choice.