Chilean sea bass sous vide is a simple way to cook rich, mild Patagonian toothfish gently in a sealed bag, then finish it with a quick, golden sear. Lemon, garlic, and herbs complement the fish without masking its buttery flavor, while a thermometer check keeps the doneness grounded in food-safety guidance.
Ingredients
- 4 Chilean sea bass fillets, about 6 ounces (170 g) each and 1 to 1¼ inches (2.5 to 3 cm) thick, skin removed or left on
- 1 teaspoon fine sea salt (5 g)
- ½ teaspoon freshly ground black pepper (1 g)
- 1 teaspoon finely grated lemon zest (2 g), from about 1 lemon
- 1 small garlic clove, lightly crushed (about 3 g)
- 4 teaspoons unsalted butter (20 g), divided among the bags
- 1 tablespoon neutral high-heat oil (15 ml), such as avocado or grapeseed oil, for searing
- 1 tablespoon chopped fresh parsley (4 g), for serving
- 4 lemon wedges (about 1 lemon), for serving
Instructions
- Preheat the water bath. Fill a sous vide container with enough water to cover the sealed fish bags without exceeding the circulator’s maximum fill line. Set the circulator to 145°F (63°C) and allow about 20 minutes for the bath to come to temperature. Keep the container on a heat-safe surface and follow the circulator’s fill and placement instructions.
- Season the fish. Pat the fillets dry and check for any pin bones by running your fingertips along the flesh; remove any bones with clean tweezers. Season both sides evenly with the salt and pepper, then add the lemon zest. Divide the fillets between vacuum-seal bags or sturdy, heat-safe sous vide bags, arranging them in a single layer. Add the crushed garlic and 1 teaspoon (5 g) butter to each bag. Avoid stacking fillets, because crowded bags heat unevenly.
- Seal the bags. Vacuum-seal according to your machine’s directions, or use the water-displacement method with a food-safe zip-top bag: lower the bag slowly into the water, keeping the open edge above the surface so the water pushes out the air, then seal it. The fish should remain submerged and the bag should not press against the circulator’s intake or heating element. Use bags specifically made for cooking; do not cook fish in its store packaging unless the package is explicitly labeled for sous vide.
- Cook the fish. Once the bath is at 145°F (63°C), submerge the sealed bags and cook for 45 minutes. Keep the fillets in one layer and make sure water can circulate around them. The USDA FSIS safe minimum internal temperature for fish is 145°F (63°C), checked with a food thermometer; confirm the center of the thickest fillet reaches that temperature before serving. If it has not, reseal the bag if needed and return it to the bath for several more minutes, then check again. Fillets thicker than 1¼ inches may need extra time.
- Remove and dry the fillets. Lift the bags from the bath and carefully take out the fish, saving the buttery cooking juices if you want to spoon a little over the finished plates. Pat the fillets very dry on all sides with paper towels. Dry surfaces brown quickly; moisture left on the fish will steam it instead of producing a crisp sear. Discard the garlic clove.
- Sear briefly. Heat a heavy skillet over medium-high to high heat until very hot, then add the oil. Place the fillets in the pan without crowding them. Sear for about 30 to 45 seconds per side, just until the surface is golden. If the fish has skin, start skin-side down and press gently for the first few seconds so it makes even contact with the pan. Handle the fillets with a thin spatula; the flesh will be delicate.
- Finish and serve. Transfer the fish to warm plates, scatter with parsley, and serve with lemon wedges. Spoon a small amount of the reserved cooking butter over each fillet if desired. Serve promptly rather than leaving the fish in the hot pan, where carryover heat can make it firmer than intended.
Tips
- Choose the right fish. Chilean sea bass is the common market name for Patagonian toothfish; the name does not guarantee that a fish was caught off Chile. Buy from a reputable fish counter, ask how it was sourced, and choose fillets of similar thickness so they finish together. If it is unavailable, black cod (sablefish) is similarly rich and buttery. Cod is a leaner substitute and can taste less lush, so keep an especially close eye on its thickness and avoid over-searing it.
- Use a thermometer, not just the timer. Thickness, starting temperature, bag arrangement, and bath circulation all affect how quickly a fillet warms through. The 45-minute time suits the thickness listed, but it does not replace checking the center for the 145°F (63°C) safe minimum. For the most reliable reading, use a clean, thin-tip instant-read thermometer in the thickest part.
- Keep seasoning restrained in the bag. Lemon zest adds fragrance without making the fish taste sharply acidic. A lemon slice can turn bitter during a long warm cook, and too much garlic can dominate the mild flesh. If using salted butter, reduce the added salt slightly. Fresh thyme can replace the parsley, but use a small sprig in the bag so its flavor stays subtle.
- Do not skip drying before searing. A wet fillet will not brown well, and leaving it in a hot skillet to compensate can overcook the edges. Have the skillet ready before the fish comes out of its bag, blot gently but thoroughly, and sear only long enough to color the outside.
Serving Suggestions
Serve each fillet with lemon wedges and a spoonful of pan juices, alongside a vegetable and a starch that can catch the buttery sauce. Roasted asparagus, green beans, or simply dressed spinach offer a fresh contrast to the fish’s richness. For a more substantial plate, add boiled baby potatoes, steamed rice, or creamy mashed potatoes. A crisp green salad with a mild vinaigrette also works well; keep the dressing light so it does not compete with the lemon and delicate fish.
For a dinner-party presentation, place the fish on a warm platter and finish it with parsley just before bringing it to the table. Serve extra lemon at the side rather than squeezing it over the whole platter, so each person can adjust the acidity. If you use the reserved bag butter, taste it first and drizzle sparingly; the concentrated fish juices can be salty, especially if the fillets were seasoned generously.
Variations
- Herb and caper finish: Replace the parsley with 1 tablespoon (8 g) chopped dill and scatter 1 tablespoon (8 g) drained capers over the fish after searing. The capers add a salty, tangy contrast, so season the fillets a little more lightly.
- Ginger and scallion: Replace the lemon zest and parsley with 1 teaspoon (2 g) finely grated fresh ginger and 1 thinly sliced scallion. Use a neutral oil for the sear and finish with a small squeeze of lemon or 1 teaspoon (5 ml) rice vinegar. This gives the plate a brighter, savory direction without changing the cooking method.
- Brown-butter finish: Skip the butter in the bags and, after searing, melt 2 tablespoons (28 g) unsalted butter in a small pan until lightly nutty and golden. Spoon a little over each portion with lemon. Watch closely, because butter can go from browned to burnt quickly.
- Simple citrus version: Use orange zest in place of lemon zest and serve with lemon wedges as written. Orange tastes sweeter and less sharp, so add only a little zest and keep the parsley to balance the finish.
Storage and Reheating
For best texture, serve sous vide fish as soon as it is seared. If you have leftovers, refrigerate them within 2 hours of cooking in a shallow, airtight container. Cooked fish keeps for 3 to 4 days in a refrigerator set at 40°F (4°C) or colder. Store the fish and any reserved cooking juices together to limit drying, but keep crisp or fresh garnishes separate.
Reheat leftovers gently in a covered skillet with a teaspoon or two of water, or in a low oven, just until heated through. Check the center with a food thermometer: USDA FSIS guidance is to reheat leftovers to 165°F (74°C). That temperature can make delicate fish firmer, so avoid repeated reheating and warm only the portion you plan to eat. A microwave can also be used in short bursts at reduced power, with the fillet covered to retain moisture; check the temperature in more than one spot. Do not re-sear already cooked leftovers for several minutes, since that tends to dry them out.
Frequently Asked Questions
Can I cook frozen Chilean sea bass sous vide?
Yes, if the fish was frozen and packaged appropriately, you can cook it from frozen in a heat-safe sealed bag. Add about 30 minutes to the bath time for these 1- to 1¼-inch portions, then check that the center reaches 145°F (63°C) with a food thermometer. If the fillets are frozen together in a solid block, separate them first so water can circulate around each piece.
Can I use a lower water-bath temperature for a softer texture?
This recipe uses 145°F (63°C) because that is the USDA FSIS safe minimum internal temperature for fish. Lower-temperature sous vide recipes may describe a softer texture, but they do not meet that stated safe minimum. For this version, use the thermometer check and keep the bath at the listed temperature rather than adjusting it downward.
Do I need to vacuum-seal the fish?
No. Vacuum sealing is convenient, but a sturdy, food-safe zip-top bag works with the water-displacement method. Press out as much air as practical, seal the top above the waterline, and make sure the bag stays submerged. If you have to use more than one bag, leave space between them so the bath circulates freely.
Why did my fish break apart when I seared it?
Chilean sea bass is tender and can flake when moved, especially after cooking. Dry the surface, use a thin fish spatula, and turn each fillet only once. A very hot pan and a short sear help create a browned exterior before the fish has time to stick. If a fillet is skinless or unusually delicate, sear only one side and serve it browned-side up.
Can I prepare the fish in advance?
You can season and bag the fillets shortly before cooking, but do not leave raw fish at room temperature while the bath heats. Keep it refrigerated until the bath is ready if there will be a delay. For the best result, cook and sear close to serving time; reheated fish is safe when brought to 165°F (74°C), but it will usually be firmer than freshly cooked fish.
Related
- Chilean Bass Recipe: Pan-Seared Sea Bass with Lemon Butter
- 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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