This Chilean sea bass recipe pairs tender, pan-seared fish with a quick lemon-caper butter sauce that is bright, savory, and rich without being heavy. The fish is sold under the name Chilean sea bass, though it is not a traditional Chilean preparation; here, simple stovetop cooking lets its mild, buttery flavor shine. Serve it straight from the pan with vegetables, potatoes, or rice to catch every drop of sauce.
Ingredients
- 4 skinless Chilean sea bass fillets, about 6 ounces (170 g) each, roughly 1 inch (2.5 cm) thick
- 1 teaspoon (5 g) kosher salt, or ¾ teaspoon (4 g) fine salt
- ½ teaspoon (1 g) freshly ground black pepper
- 1 tablespoon (15 ml) olive oil
- 3 tablespoons (42 g) unsalted butter, divided
- 2 tablespoons (18 g) capers, drained; rinse them first if they taste especially salty
- 1 small shallot, finely minced, about 2 tablespoons (20 g)
- 1 small garlic clove, finely minced, about 1 teaspoon (3 g)
- ¼ cup (60 ml) dry white wine or low-sodium fish or chicken broth
- 1 tablespoon (15 ml) fresh lemon juice, plus lemon wedges for serving
- 1 teaspoon finely grated lemon zest, about 2 g
- 1 tablespoon chopped fresh parsley, about 4 g
Instructions
- Prepare the fish and aromatics. Pat the fillets very dry on all sides with paper towels; surface moisture can prevent browning and make the fish stick. Check for pin bones by running a clean fingertip along the center line and pull out any you find with fish tweezers or clean pliers. Season both sides with the salt and pepper. Mince the shallot and garlic, drain the capers, and zest and juice the lemon. Keep the juice separate from the zest so you can add each at the right time.
- Heat the pan. Set a large stainless-steel or well-seasoned cast-iron skillet over medium-high heat for about 2 minutes. Add the olive oil and 1 tablespoon (14 g) of the butter. When the butter has melted and the oil looks glossy, tilt the pan to coat it. If your pan cannot fit all four fillets without crowding, cook in two batches; overcrowding cools the pan and encourages the fish to steam.
- Sear the first side. Lay the fillets in the pan with a little space between them, lowering them away from you to reduce splatter. Leave them undisturbed for about 4 minutes. The edges should begin to turn opaque, and the underside should release from the pan more easily when it is ready to turn. If a fillet resists, give it another 30 seconds rather than pulling hard and tearing the surface.
- Turn and finish cooking. Use a thin fish spatula to turn each fillet carefully. Cook the second side for about 3 to 4 minutes, adjusting for thickness. Check the thickest part with an instant-read food thermometer: fish should reach 145°F (63°C), the USDA FSIS safe minimum internal temperature. If it has not reached that temperature, continue cooking in short increments and check again. Transfer the cooked fish to a warm plate.
- Start the lemon-caper sauce. Reduce the heat to medium. Add the shallot to the same skillet and cook for about 1 minute, stirring and scraping up the browned bits. Add the garlic and capers and stir for about 30 seconds, just until fragrant; do not let the garlic brown. Pour in the wine or broth and simmer for 1 to 2 minutes, until slightly reduced. If using wine, the sauce will have a more rounded, aromatic flavor; broth makes a good alcohol-free alternative.
- Finish and serve. Turn off the heat. Stir in the lemon juice and zest, then whisk in the remaining 2 tablespoons (28 g) butter a little at a time until the sauce looks glossy. Stir in the parsley, taste, and adjust with a small pinch of salt or a little more lemon juice if needed. Spoon the sauce over the fish and serve promptly with lemon wedges. The fish rests while you make the sauce, so no separate resting period is needed.
Tips
- Dry fish browns better. Pat the surface thoroughly dry, especially if the fillets were thawed. If they still look wet, leave them uncovered on a plate in the refrigerator for 10 to 15 minutes, then pat them again. Do not rinse raw fish in the sink, where splashes can spread contamination.
- Use a thermometer instead of relying only on the clock. Fillets vary in thickness, and a thicker piece takes longer than a thin one. Insert the thermometer sideways into the center of a fillet so the tip measures the coolest part. Remove the pan from the heat once the fish reaches the safe temperature; continued cooking can make its delicate flesh dry.
- Choose a pan that gives the fillets room. Cook in batches if necessary, and add a little more oil before the second batch if the pan is dry. Keep the first batch loosely covered in a warm place while you cook the rest, then make the sauce after all the fish is seared. The sauce benefits from the browned bits, but avoid scorching them.
- Adjust the salt to your capers and broth. Capers and regular broth can both be salty. Rinse very briny capers and choose low-sodium broth if you have it. Taste the finished sauce before adding any extra salt; lemon can sharpen the flavor without adding more seasoning.
Serving Suggestions
Serve each fillet with a generous spoonful of sauce and a lemon wedge. The buttery sauce pairs particularly well with sides that can absorb it: steamed or roasted potatoes, plain rice, couscous, or a slice of crusty bread. For a lighter plate, add asparagus, green beans, sautéed spinach, or a crisp salad with a simple vinaigrette. Keep strongly flavored sides modest so they do not overwhelm the mild fish.
For a dinner that feels complete but stays manageable, roast potatoes first and cook the fish while they finish. Alternatively, spoon the sauce over fish and vegetables together on a platter, adding parsley just before serving. If the sauce thickens while it sits, stir in a teaspoon of warm water or broth. The recipe makes enough sauce to coat the fillets, not a large pool, so pass any remaining sauce at the table.
Variations
Use another firm white fish. Halibut, cod loin, or thick haddock can stand in for Chilean sea bass. Their flavor and fat content differ: halibut is mild and substantial, while cod is leaner and may flake more readily. Start checking thinner portions earlier and use the same 145°F (63°C) internal-temperature target. Avoid crowding the pan, and handle flaky fish gently when turning.
Make the sauce without wine. Replace the white wine with low-sodium fish stock, chicken broth, or vegetable broth. Broth gives a gentler, less aromatic sauce but still provides liquid to loosen the browned bits. For a little extra brightness, add a teaspoon of broth at a time alongside the lemon juice, tasting as you go rather than making the sauce overly sour.
Add herbs or a mild heat. Swap the parsley for chopped chives, dill, or a small amount of tarragon; each changes the character of the sauce, with dill especially fresh and tarragon more fragrant. For gentle heat, add a pinch of red pepper flakes with the garlic. You can also add a teaspoon of rinsed, chopped preserved lemon, but reduce the added lemon juice and salt because preserved lemon is already tangy and salty.
Use a little less butter. For a lighter-tasting sauce, finish with 1 tablespoon (14 g) of butter instead of 2 and add a tablespoon of broth. The result will be less silky and rich but still carry the caper and lemon flavor. Do not boil the sauce after adding butter; gentle heat helps it stay smooth.
Storage and Reheating
Refrigerate leftover fish within 2 hours of cooking, placing it in a shallow, covered container. Store the fish and sauce together or separately, and use within 3 to 4 days. The fish is at its best in texture soon after cooking; refrigeration can make it firmer and less moist. Do not leave cooked seafood at room temperature for longer than 2 hours, or 1 hour if the surrounding temperature is above 90°F (32°C).
To reheat, place the fish and sauce in a covered oven-safe dish with a teaspoon of water or broth. Warm in a 275°F (135°C) oven until the center reaches 165°F (74°C), the safe temperature for reheated leftovers. Check with a food thermometer and avoid leaving it in the oven longer than needed. A microwave also works: cover loosely, heat at medium power in short intervals, and check the thickest part for 165°F (74°C). The sauce may separate slightly; stir it gently before serving. Freezing is possible in an airtight container for about 1 to 2 months for best quality, though the texture may become softer after thawing overnight in the refrigerator.
Frequently Asked Questions
Is Chilean sea bass actually from Chile?
“Chilean sea bass” is a common market name for Patagonian toothfish, a deep-water fish found in the southern oceans. The name does not mean this lemon-caper preparation is a traditional Chilean dish. Check the package or ask the fishmonger about the fish’s source and handling if that information matters to your purchase.
Can I use frozen Chilean sea bass?
Yes. Thaw it overnight in the refrigerator, still in a leakproof package or in a covered dish. If it is vacuum-packed, follow the package directions for thawing; some vacuum-packed fish should be removed from the packaging before refrigerator thawing. Pat the thawed fillets very dry before seasoning and searing, since thawed fish can release more moisture.
How do I know when the fish is done?
The most reliable check is an instant-read thermometer inserted into the thickest part. Cook to 145°F (63°C), the USDA FSIS safe minimum for fish. The flesh should also look opaque and separate into flakes with gentle pressure, but appearance alone is less dependable, especially with a thick fillet.
Can I prepare the lemon-caper sauce ahead?
You can mince the shallot and garlic, drain the capers, and zest and juice the lemon several hours ahead; cover and refrigerate them separately. For the best texture, make the butter-finished sauce just before serving. If you make it early, cool and refrigerate it promptly, then rewarm gently while stirring. Avoid a hard boil, which can cause the butter to separate.
What can I use instead of capers?
Chopped green olives are the closest easy substitute, though they taste fruitier and less sharply briny. Begin with about 1 tablespoon (10 g) finely chopped olives, taste the sauce, and add more if you like. Finely chopped cornichons can also work, but they add vinegar tang rather than capers’ salty, floral bite.
Can I bake the fish instead of pan-searing it?
Yes. Put seasoned fillets in a lightly oiled baking dish and bake at 400°F (200°C) until the thickest part reaches 145°F (63°C), checking early because timing depends on thickness. Make the sauce separately in a skillet and spoon it over the baked fish. Baking will not give the same browned surface, but it is a useful option if you are cooking several portions at once.
Related
- Is Chilean Food Spicy? Heat, Peppers, and Flavor
- Wild Chilean Sea Bass Recipe with Garlic Lemon Butter
- Chilean Bass Recipe: Pan-Seared Sea Bass with Lemon Butter
More recipes to cook
Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
Spotted an error? Tell us and we will correct it (corrections policy).