Cast Iron Skillet Salmon: Crisp Skin, Tender Fish

Cast iron skillet salmon is pan-seared salmon fillets with a browned, crisp exterior and a tender center, finished here with lemon, garlic, parsley, and butter. A well-heated skillet gives the skin good contact with the pan, while a short cook keeps the fish moist and makes this an easy dinner to serve straight from the stove.

Ingredients

4 skin-on salmon fillets, about 6 oz (170 g) each and 1 to 1¼ inches (2.5 to 3 cm) thick
1 tsp (5 g) fine salt
½ tsp (1 g) freshly ground black pepper
1 tbsp (15 ml) neutral high-heat oil, such as canola or avocado oil
2 tbsp (28 g) unsalted butter
1 garlic clove, finely minced, about 1 tsp (3 g)
1 tsp (2 g) finely grated lemon zest
1 tbsp (15 ml) fresh lemon juice
1 tbsp (4 g) finely chopped fresh parsley
1 tbsp (9 g) drained capers, optional
Lemon wedges, for serving, about 1 lemon (85 g)

Instructions

Prepare the salmon and aromatics, 10 minutes. Keep the salmon refrigerated until you are ready to start. Pat each fillet very dry on all sides with paper towels; drying the skin well is especially important for browning. Check for pin bones by running a clean finger over the flesh and pull any out with tweezers. Season both sides with the salt and pepper. Mince the garlic, zest and juice the lemon, and chop the parsley. Set the butter and optional capers beside the stove so they are ready to add quickly.
Preheat the skillet, 4 minutes. Set a 12-inch (30 cm) cast iron skillet over medium heat for about 4 minutes. It should be hot enough that a small drop of water sizzles away, but the pan should not be smoking. Add the oil and swirl to coat the cooking surface. If the oil starts to smoke heavily, lift the pan off the heat briefly and lower the setting; excessively hot oil can make the skin bitter before the fish cooks through.
Start skin-side down, about 6 minutes. Lay the fillets in the skillet skin-side down, placing them away from you to avoid splashes. Leave a little room between pieces; cook in two batches if they would be crowded. For the first 15 to 20 seconds, press each fillet gently with a fish spatula so the skin makes even contact with the pan. Then let the salmon cook undisturbed for about 6 minutes. The skin should turn golden and release more easily as it crisps. If a fillet sticks, give it another 30 seconds rather than scraping it loose.
Turn and finish the flesh side, 3 minutes. Slide a thin spatula under each piece and turn it carefully. Cook the flesh side for about 2 to 3 minutes, adjusting for thickness. The sides will look opaque as the fish cooks, but color alone is not a reliable safety check. Insert an instant-read food thermometer horizontally into the thickest part of a fillet without touching the pan. USDA FSIS lists 145°F (63°C) as the safe minimum internal temperature for fish; cook until the thermometer reaches that temperature.
Add the lemon-garlic butter, 1 minute. When the salmon is nearly done, lower the heat and add the butter, garlic, lemon zest, and capers if using. Let the butter melt and the garlic sizzle gently for about 30 to 60 seconds; do not let the garlic turn dark brown. Tilt the skillet carefully and spoon the melted butter over the fish once or twice. Remove the pan from the heat as soon as the fish reaches the safe temperature.
Finish and rest, 3 minutes. Transfer the fillets to plates or a warm platter, spoon over the pan butter, and add the lemon juice and chopped parsley. Let the salmon rest for 3 minutes before serving. The short rest gives the butter time to settle over the fish; it is not a substitute for checking the temperature. Serve with lemon wedges and any extra pan sauce.

Tips

Dry the skin thoroughly. Moisture on the surface creates steam, which works against crisp skin. If the salmon is wet from thawing, pat it dry, replace the paper towels if needed, and check the underside again before seasoning. A few minutes of careful drying matters more than adding extra oil.

Choose fillets of similar thickness. Pieces that are close in size finish at roughly the same time. If one tail piece is much thinner than the others, tuck its narrow end under itself or remove it from the skillet earlier after checking its temperature. Frozen salmon should be thawed in the refrigerator and dried well before cooking; cooking from frozen makes this sear method harder to control.

Give the pan enough room. Crowding lowers the skillet temperature and makes the fish release moisture. Cook in batches if necessary, and let the pan return to temperature between batches. Cast iron retains heat, so medium is usually enough; turning the burner to high can scorch the oil and garlic.

Use a thermometer, not a guessed number of minutes. Fillet thickness, starting temperature, and burner strength all affect the timing. If the salmon needs longer after turning, lower the heat and cook in short 30-second intervals, checking again at the thickest point. If the butter browns too quickly, remove the skillet from the burner before adding the lemon juice.

Serving Suggestions

Serve the salmon while the skin is crisp and the butter is warm. It pairs well with steamed or roasted vegetables such as green beans, asparagus, broccoli, or carrots, along with a simple green salad. For a more filling plate, add rice, couscous, boiled baby potatoes, or mashed potatoes; each can soak up the lemony butter. A slice of crusty bread is also useful for the sauce.

If serving several people, set the fish on a platter skin-side up so steam does not collect against the crisp surface. Spoon most of the sauce over the flesh rather than pouring it across the skin. Put extra lemon wedges and parsley on the table so diners can adjust the brightness and herbs to taste. For a quick weeknight meal, serve one fillet per person with a vegetable and a grain that can cook while the skillet heats.

Variations

Herb and citrus swap: Replace the parsley with 1 tbsp (3 g) chopped dill or chives, and use orange zest instead of lemon zest. Dill gives the butter a fresh, grassy flavor; orange makes it softer and slightly sweeter. Keep the lemon juice for balance, or use 1 tbsp (15 ml) orange juice for a gentler citrus finish.

Spicy salmon: Add ¼ tsp (0.5 g) crushed red pepper flakes to the butter with the garlic. For a smoky note, season the fish with ½ tsp (1 g) smoked paprika along with the salt and pepper. Avoid adding sugary glazes before searing, since sugar can burn against the hot cast iron; brush on a small amount during the final minute instead.

Mustard-caper finish: After transferring the salmon to a plate, stir 1 tsp (5 g) Dijon mustard into the lemon-butter sauce, then spoon it over the fish. The mustard makes the sauce tangier and a little more savory. If capers are unavailable, leave them out rather than replacing them with extra salt; chopped green olives can work, but bring a stronger briny flavor.

Skinless fillets: The recipe also works with skinless salmon, but it will not have a crisp skin layer and can be more delicate to turn. Use a thin, wide spatula and check the underside after about 4 minutes. Turn only when the fish releases readily, then finish and check the temperature as directed. Cooking time can vary, so let the thermometer determine when it is done.

Storage and Reheating

Refrigerate leftover salmon within 2 hours of cooking, in a shallow airtight container. Cooked salmon keeps for 3 to 4 days in the refrigerator. Store the fish and any extra sauce together if you want the butter to protect the surface from drying, or keep them separately if you prefer to reheat the sauce on its own. Do not leave cooked fish at room temperature for longer than 2 hours.

For the gentlest reheating, place a portion in a covered skillet over low heat with a teaspoon of water or broth. Warm it slowly, turning once if needed, until leftovers reach 165°F (74°C), the USDA FSIS recommended temperature for reheated leftovers. The fish may become firmer when reheated, so avoid prolonged high heat. A microwave also works: cover loosely, heat in short intervals, and check the center with a food thermometer. You can also flake cold leftover salmon into a salad or grain bowl without reheating it, provided it has been stored safely.

To freeze cooked portions, wrap them airtight and freeze for up to 2 to 3 months for best quality. Thaw in the refrigerator and reheat to 165°F (74°C). The skin will soften after freezing and reheating, but the lemon-butter flavor remains useful in salads, pasta, or rice bowls.

Frequently Asked Questions

Should salmon be at room temperature before it goes into the skillet? No. Keep it refrigerated until you are ready to pat it dry and season it. Cold fish may need slightly longer to cook than fish that has been out briefly, so use the thermometer rather than leaving raw seafood on the counter to warm up.

How do I stop salmon skin from sticking to cast iron? Start with a clean, well-seasoned skillet, dry the skin thoroughly, and preheat the pan before adding oil. Place the salmon skin-side down and avoid moving it during the first several minutes. When the skin has browned, it generally releases more easily; if it still grips the pan, allow another short interval before trying again.

Can I cook this recipe with frozen salmon? Thaw the fillets in the refrigerator first for the most even cooking and best browning. A quick-thawed fillet may hold surface water, so dry it carefully. Cooking the fish while still frozen is not recommended for this particular stovetop method because the exterior can overcook before the center reaches 145°F (63°C).

Can I use a different pan? Yes. A heavy stainless-steel skillet can also sear salmon, though it may heat less evenly or cool more quickly than cast iron. A nonstick pan is less likely to produce deeply crisp skin, but it can be used with a little oil and careful heat control. Follow the same thermometer guidance whichever pan you choose.

Why did the butter turn brown or the garlic taste bitter? The skillet may have been too hot, or the butter and garlic may have been added too early. Sear the fish first, lower the heat, and add the butter near the end. Garlic needs only a brief, gentle sizzle; if it darkens quickly, take the pan off the burner and add the lemon juice to slow the cooking.

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).