Chilean Sea Bass with Lemon Caper Brown Butter

This Chilean sea bass with lemon caper brown butter is the kind of dish that feels special enough for a dinner party but comes together in one skillet in under 30 minutes.

The secret is a hot cast iron pan that gives the fish a crisp golden crust, then a quick brown butter sauce with bright lemon and briny capers. The result is a glossy, nutty, tangy sauce that clings to every flaky bite. It's a simple yet impressive way to cook a premium fish.

Chilean sea bass is prized for its buttery texture and large, moist flakes. In this recipe, thick fillets are seared until golden, then finished with a brown butter sauce flavored with lemon wheels and capers.

The lemon adds brightness, the capers bring salt and brine, and the butter turns nutty as it browns. A shower of fresh parsley and aged Asiago cheese completes the dish. This is a quick, elegant dinner that tastes like it came from a fine restaurant, but it's simple enough for a weeknight.

Ingredients

Why this recipe works

Searing the fish in a hot cast iron skillet creates a deep golden crust that contrasts with the moist interior. The high heat caramelizes the surface of the fish, adding flavor and texture. This crust also helps the fish hold together when you spoon the sauce over it.

Brown butter is the backbone of the sauce. As the butter melts and foams, the milk solids toast and turn amber, developing a nutty aroma.

The lemon wheels and capers are added to the bubbling butter, infusing it with citrus and brine. Spooning this sauce over the fish while it's still hot ensures every bite is coated in rich, savory flavor.

Notes and substitutions

Chilean sea bass is a sustainable choice when certified. Look for thick, even fillets with a fresh, mild scent. If unavailable, other firm white fish like halibut or cod work well, though cooking times may vary. The fish is done when it flakes easily with a fork and reaches 145°F (63°C).

Aged Asiago cheese is salty and nutty, perfect for grating over the finished dish. If you can't find it, Parmigiano-Reggiano or Grana Padano are excellent substitutes.

Use unsalted butter to control the salt level, especially since capers and cheese add saltiness. Fresh parsley is a must—dried parsley won't give the same bright finish.

• Chilean sea bass: Substitute halibut, cod, or striped bass for a similar flaky texture. Adjust cooking time if fillets are thinner.
• Aged Asiago: Use Parmigiano-Reggiano or Grana Padano for a similar nutty, salty flavor.
• Unsalted butter: Salted butter works, but reduce added salt in the recipe.

Equipment

• Box grater
• Cast iron skillet
• Fish spatula
• Cutting board
• Chef's knife
• Measuring spoons