This Chilean sea bass recipe pairs thick, pan-seared fish with a quick lemon-caper butter sauce, then finishes the fillets in the oven for even cooking. The name Chilean sea bass is a market name for Patagonian toothfish, not a guarantee that the fish was caught off Chile; its rich, firm flesh works especially well with a bright, buttery sauce.
Ingredients
- 4 skinless Chilean sea bass fillets, about 6 oz (170 g) each and 1 to 1¼ inches (2.5 to 3 cm) thick
- ¾ tsp (4 g) fine salt
- ¼ tsp (0.5 g) freshly ground black pepper
- 1 tbsp (15 ml) neutral high-heat oil, such as avocado or canola oil
- 4 tbsp (56 g) unsalted butter, divided
- 1 small shallot, finely minced, about ¼ cup (35 g)
- ⅓ cup (80 ml) dry white wine
- 2 tbsp (30 ml) fresh lemon juice, from about 1 lemon
- 1 tsp finely grated lemon zest, from about 1 lemon
- 2 tbsp (18 g) drained capers, roughly chopped if large
- 1 tbsp (4 g) finely chopped fresh parsley
- 1 tbsp (3 g) finely chopped fresh chives, optional
Instructions
- Heat the oven and prepare the fish. Set a rack in the middle of the oven and preheat it to 425°F (220°C). While it heats, pat the fillets thoroughly dry with paper towels; dry surfaces brown more readily than damp ones. Check carefully for pin bones and remove any with clean tweezers. Season both sides with the salt and pepper. Let the fish sit at room temperature only while you finish the brief preparation, not for an extended period.
- Sear the first side. Heat the oil and 1 tablespoon (14 g) of the butter in a large oven-safe skillet over medium-high heat. When the butter foams and the pan is hot, arrange the fillets in one layer with space between them. Lay each fillet away from you to reduce splatter. Sear without moving the fish for about 4 minutes, until the underside is deeply golden and releases from the pan with gentle encouragement. If your skillet is too small to leave a little space between fillets, sear in batches rather than crowding them.
- Turn and finish in the oven. Use a thin fish spatula to turn each fillet carefully. Sear the second side for 2 minutes, then transfer the skillet to the preheated oven. Roast for 5 to 8 minutes, depending on thickness. Check the thickest part with an instant-read food thermometer; USDA FSIS lists 145°F (63°C) as the safe minimum internal temperature for fish. If a fillet is not there yet, return it to the oven and check again after 1 to 2 minutes. Take care when removing the skillet, and set it on a heatproof surface with a clear reminder that the handle is hot.
- Make the sauce while the fish roasts. In a small saucepan, melt 2 tablespoons (28 g) butter over medium-low heat. Add the minced shallot and cook for 2 to 3 minutes, stirring, until softened but not browned. Pour in the wine and simmer for about 2 minutes, until reduced by roughly half. Stir in the lemon juice, zest, and capers. Lower the heat and whisk in the remaining 1 tablespoon (14 g) butter until the sauce looks glossy. Take the pan off the heat and stir in the parsley and chives. If the sauce finishes before the fish, keep it warm over the lowest heat; do not let it boil.
- Rest briefly and serve. Move the cooked fillets to warm plates and let them stand for 2 minutes. Spoon the lemon-caper butter sauce over the fish or around each fillet so the browned top remains visible. Taste the sauce before adding any more salt, since capers can be quite salty. Serve promptly with lemon wedges if desired.
Tips
- Choose similar-sized portions. Fillets of roughly equal thickness finish at about the same time. If one piece is noticeably thinner, check it early and take it out as soon as it reaches 145°F (63°C); leave thicker pieces in the oven while they finish. The thermometer reading matters more than the clock, because fillet shape and starting temperature vary.
- Dry the fish and avoid forcing a flip. Moisture on the surface can make fish steam instead of brown. Once the first side has formed a crust, it should release more easily. If it sticks firmly, give it another 30 seconds and try again with a thin spatula rather than pulling and breaking the fillet.
- Adjust the wine if needed. For a sauce without alcohol, use ⅓ cup (80 ml) low-sodium fish stock or chicken broth in place of the wine. The result will be slightly less aromatic and may taste less rounded, so simmer it until reduced by about half and taste for lemon and salt before serving. Water works in a pinch, but makes a less savory sauce.
- Keep the sauce gentle. Butter can separate if the pan is too hot or the sauce boils after the butter is whisked in. Lower the heat before adding the final butter, and whisk it in gradually. If it separates, take it off the heat and whisk in a teaspoon of warm water to help it come together again.
Serving Suggestions
Serve each fillet with enough sauce for a few spoonfuls, rather than burying its crisp surface. The lemon and capers pair well with simple sides that can absorb a little butter: steamed or roasted asparagus, green beans, sautéed spinach, or broccoli. For a more substantial plate, add boiled baby potatoes, rice, or a modest portion of mashed potatoes. A plain grain or potato is useful here because the sauce already brings richness and acidity.
A crisp green salad with a light vinaigrette can balance the buttery fish, while roasted cherry tomatoes add sweetness and color. If serving several people, warm the plates first and bring the sauce to the table in a small jug; the fish cools quickly, and diners can add the amount they like. Keep any extra lemon wedges separate so each person can adjust the brightness without changing the sauce for everyone.
Variations
Use another firm white fish. Halibut is the closest substitute in texture and can be cooked with the same sear-and-oven method, though thinner portions need less oven time. Cod also works, but its flakes are more delicate, so turn it carefully and check it early. The exact cooking time depends on thickness; use the same 145°F (63°C) endpoint rather than assuming the original timing will fit every fish.
Make a garlic-herb version. Add one finely grated garlic clove to the shallot during its final 30 seconds of cooking, then finish the sauce with parsley, dill, or tarragon. Garlic burns quickly, so do not add it at the start of the shallot step. For a milder, softer sauce, leave out the capers and add an extra teaspoon of lemon juice only after tasting.
Add a little cream. For a silkier, less sharply buttery sauce, stir 2 tablespoons (30 ml) heavy cream into the reduced wine before adding the lemon and capers. Simmer briefly, then whisk in the butter off the heat. This makes the sauce richer and a little less tangy; taste and add lemon gradually so it remains balanced.
Change the citrus or capers. A small amount of orange zest alongside the lemon gives the sauce a rounder, sweeter aroma without making it taste like an orange sauce. If capers are unavailable, finely chopped green olives can offer a similar salty note, though their flavor is more olive-forward and less briny. Start with 1 tablespoon (8 g) chopped olives, taste, and add more only if needed.
Storage and Reheating
Refrigerate cooked fish and sauce within 2 hours of cooking. Store them in separate airtight containers if possible; the fish keeps its texture somewhat better without sitting in sauce. Refrigerated cooked fish is best within 1 to 2 days for quality, and cooked leftovers should be used within 3 to 4 days. If the fish has been left at room temperature for more than 2 hours, discard it rather than saving it.
For the best texture, reheat a portion gently in a covered oven-safe dish at 275°F (135°C), adding a teaspoon of water or broth to prevent it drying out. Heat until the center reaches 165°F (74°C), the safe temperature for reheated leftovers, checking with a food thermometer. A microwave also works: cover the fish, use medium power in short intervals, and check the center between intervals. The fish may become firmer after reheating, so avoid prolonged high heat.
Warm leftover sauce separately in a small pan over low heat, whisking gently. If it looks thick, whisk in a teaspoon of water; do not bring it to a boil. Freezing cooked fish is possible for up to about 2 months for quality, but the delicate texture may turn drier or softer after thawing. Thaw it in the refrigerator and reheat it safely; avoid freezing and thawing the sauce if a smooth texture is important.
Frequently Asked Questions
Is Chilean sea bass actually from Chile?
The name is a common market name for Patagonian toothfish and does not, by itself, identify where an individual fish was caught. Check the package or ask the fish seller about its species and origin. The name became familiar in seafood markets, but the fish is not a Chilean seabass species in the same sense as a fish biologically named seabass.
Can I cook this without an oven-safe skillet?
Yes. Sear the fish in a regular skillet, then transfer the fillets to a lightly oiled baking dish for the oven step. Avoid putting a skillet with a plastic or otherwise non-oven-safe handle in the oven. The baking dish may not be as hot as the skillet, so the fish could need an extra minute or two; check its internal temperature rather than relying only on the listed time.
Can I make the lemon-caper sauce ahead?
You can mince the shallot, chop the herbs, zest the lemon, and measure the sauce ingredients a few hours ahead, keeping them covered and chilled. The sauce itself is best made just before serving because butter sauces can separate as they cool and reheat. If you do make it early, warm it gently and whisk in a teaspoon of warm water if needed to restore a smoother consistency.
How can I tell when the fish is done?
The most reliable check is a food thermometer inserted sideways into the thickest part of a fillet, away from the pan. Cook fish to 145°F (63°C), the USDA FSIS safe minimum internal temperature. At that point it should be opaque and separate into flakes when gently pressed, but visual cues can be harder to judge in a thick, rich-fleshed piece, so a thermometer is preferable.
Why did my fillet fall apart when I turned it?
It may have been moved before the browned surface had time to release, or the spatula may not have supported enough of the fillet. Let it sear undisturbed, then slide a thin spatula fully beneath the piece before turning. If a fillet does break, it will still taste good; serve the pieces with the sauce and avoid repeatedly moving them in the pan.
Related
- Traditional Chilean Empanada Recipe: Empanadas de Pino
- Chilean Cuisine Recipes: Pastel de Choclo
- Is Chilean Food Spicy? Heat, Peppers, and Flavor
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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