Swordfish Steak Recipe: Grill-Marked With Lemon-Herb Finish

There’s a reason swordfish steaks are a favorite among seafood lovers—rich flavor, firm texture, and a natural ability to hold up to bold seasonings. This recipe highlights those qualities with a simple yet restaurant-quality approach.

High heat is key, creating those coveted grill marks while keeping the inside tender and moist. A quick finish with fresh lemon and herbs elevates the dish without overpowering the fish’s natural taste.

The result is a perfectly seared steak with a caramelized crust and juicy center, complemented by bright citrus notes. It’s a dish that feels special but comes together with minimal effort.

Serve with roasted vegetables or a light salad for a complete meal. Here’s how to make it right every time.

Ingredients for Swordfish Steak

Quality swordfish and fresh herbs create this standout seafood dish with minimal effort.

The swordfish is everything here. Look for sushi-grade steaks from a trusted seafood counter—Whole Foods or a local fishmonger are solid bets. Steaks should be about 1 inch thick and uniform in size for even cooking. Avoid any with a fishy odor or dull flesh. The olive oil matters too—use a good quality extra-virgin for finishing, but regular works for the high-heat cooking.

No fresh herbs? Dried at one-third the amount works, but the flavor won’t be as bright. Short on lemon? Lime juice in a pinch, though the zest is non-negotiable for that citrus pop. If swordfish isn’t available, halibut or mahi-mahi are sturdy substitutes. The butter can be omitted for a lighter finish, but it adds a richness that’s worth the extra calorie.

Best eaten fresh, but leftovers keep for 1-2 days in the fridge. Store in an airtight container and reheat gently in a skillet—microwaving can dry it out. The fresh herbs can be prepped a day ahead; keep them wrapped in damp paper towels to stay vibrant.

Step-by-Step Instructions for Swordfish Steak

Here’s the method to achieve perfectly grill-marked swordfish with a bright, herby finish.

Step 1: Season the Swordfish Steaks

Pat the swordfish steaks dry with paper towels to ensure a good sear. In a small bowl, combine the 1.5 tsp Kosher Salt, 1 tsp Black Pepper, 1 tsp Garlic Powder, and 0.5 tsp Smoked Paprika.

Rub this seasoning blend evenly over all sides of the 4 pieces Swordfish Steaks. The spice mixture should adhere well to the slightly tacky surface of the fish. Let the seasoned steaks sit at room temperature for 10 minutes while you prepare the grill.

Step 2: Sear the Swordfish on High Heat

Heat a grill or grill pan over medium-high heat. Brush the grates with 1 tbsp Olive Oil from the 3 tbsp Olive Oil. When the grill is hot, you should see the oil shimmer and a drop of water should sizzle and evaporate immediately.

Place the swordfish steaks on the grill and cook undisturbed for 4-5 minutes per side. You want to see distinct grill marks forming and the edges of the steaks should begin to look opaque. Avoid moving the steaks during this time to get those perfect char marks.

Step 3: Baste with Lemon Butter and Finish

While the swordfish cooks, zest the 1 whole Fresh Lemon and juice half of it. In a small bowl, combine the lemon juice, zest, and 2 tbsp Unsalted Butter. Melt this mixture in the microwave for 20-30 seconds until the butter is just melted.

During the last 2 minutes of grilling, brush the swordfish steaks generously with the lemon butter mixture. This adds a glossy finish and infuses the fish with bright citrus flavor. The swordfish is done when it flakes easily with a fork and reaches an internal temperature of 145°F.

Step 4: Garnish and Serve Immediately

Transfer the swordfish steaks to a serving platter. Drizzle any remaining lemon butter over the top, then sprinkle with the 0.25 cup Fresh Parsley and 0.25 cup Fresh Dill. The herbs should be finely chopped for even distribution.

Serve the swordfish immediately while hot, with the remaining lemon half cut into wedges for squeezing. The fish should have a golden-brown crust with moist, tender flesh inside. The lemon-herb finish adds a fresh, vibrant note that complements the rich, meaty swordfish perfectly.

Essential Equipment for This Recipe

Grill Essentials

For perfect grill marks, I swear by my Weber Genesis EX-335 gas grill—it heats evenly and maintains medium-high heat beautifully. A cast iron grill pan works just as well indoors if you don’t have outdoor space. Always preheat for 10-15 minutes to get those searing temps. 🔥

Precision Tools

A good instant-read thermometer (I use ThermoWorks Thermapen) ensures you hit that perfect 145°F internal temp every time. Don’t guess—fish cooks fast, and overcooking ruins the texture. Also, keep a basting brush handy for that lemon butter finish.

Prep Gear

Use a paper towel to pat the steaks dry—moisture prevents a good sear. A small mixing bowl helps combine your spices evenly. For zesting, a Microplane is my go-to—it extracts every bit of lemon flavor without the bitter pith.

Serving Essentials

A large platter makes for easy serving, and a sharp chef’s knife (I use Wüsthof) ensures clean cuts. Have tongs ready for flipping—never pierce the fish, or you’ll lose those precious juices. 💛

Cleanup Helpers

A grill brush with a long handle keeps your grates clean between uses. For indoor cooking, a splatter screen saves your stovetop from messy oil sprays. Both are small investments that make the process smoother.

Frequently Asked Questions