Best Swordfish Recipe Grill: Smoky Char With Lemon-Herb Finish

Grilling swordfish to perfection requires high heat and precise timing. The key is a hot grill and thick cuts to prevent drying.

This method delivers a smoky char with a tender center, finished with fresh lemon and herbs for a bright, professional result.

Ingredients for Best Swordfish Recipe Grill

Thick swordfish steaks, citrus, and herbs create a restaurant-quality grilled dish with minimal effort.

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The swordfish is non-negotiable—1-inch thick steaks from a reputable seafood counter (I trust Whole Foods or local fishmongers) prevent drying. Look for sushi-grade if available, with a firm, translucent appearance and no fishy odor. The thickness ensures even cooking without over-char. For olive oil, California Olive Ranch or Colavita deliver consistent quality for high-heat grilling.

No fresh herbs? Dried at one-third the amount works, but fresh is ideal for that bright finish. Short on lemon? Lime or orange zest adds a nice twist. If swordfish isn’t available, tuna steaks or halibut (slightly thicker cuts) can substitute, though cooking times may vary. The Dijon can be swapped for whole-grain mustard for a coarser texture.

Grilled swordfish is best served immediately, but leftovers (if any) hold for 1-2 days refrigerated. Reheat gently in a skillet—microwaving ruins the texture. The marinade can be prepped 24 hours ahead, but don’t marinate the fish longer than 30 minutes (the acid starts to ‘cook’ it). Always bring swordfish to room temp before grilling for even cooking.

Step-by-Step Instructions for Grilled Swordfish

Master the technique for perfectly charred swordfish with a bright, herbaceous finish.

Step 1: Prepare the Lemon-Herb Marinade

In a small bowl, whisk together 2 tbsp Extra-Virgin Olive Oil, 1 tbsp Dijon Mustard, the zest of 1 whole Fresh Lemon, 3 cloves minced Garlic Cloves, 1.5 tsp Kosher Salt, 1 tsp Freshly Ground Black Pepper, and 0.5 tsp Red Pepper Flakes.

Strip the leaves from 4 sprigs Fresh Thyme Sprigs and finely chop them before adding to the marinade. This infusion of citrus and herbs will penetrate the swordfish, ensuring every bite is flavorful. Let the marinade sit for 5 minutes to allow the flavors to meld.

Step 2: Marinate the Swordfish Steaks

Pat the 1.5 lb Swordfish Steaks dry with paper towels to ensure a good sear. Place them in a shallow dish and pour the marinade over, turning to coat evenly. Let them marinate at room temperature for 15-20 minutes—any longer and the acid in the lemon can start to “cook” the fish.

While the swordfish marinates, preheat your grill to medium-high heat. You want the grates hot enough to create distinct char marks without burning the exterior before the inside cooks through.

Step 3: Grill the Swordfish to Perfection

Brush the grill grates with the remaining 1 tbsp Extra-Virgin Olive Oil to prevent sticking. Place the swordfish steaks on the grill and cook undisturbed for 4-5 minutes per side. The steaks are ready to flip when they release easily from the grates and have developed a golden-brown crust.

Resist the urge to move the steaks around—this ensures clean char marks and even cooking. The swordfish is done when it reaches an internal temperature of 145°F and flakes easily with a fork.

Step 4: Finish with Fresh Herbs and Lemon

Transfer the grilled swordfish to a serving platter. Squeeze the juice of the remaining Fresh Lemon over the steaks. Sprinkle with 0.25 cup finely chopped Fresh Flat-Leaf Parsley and 2 tbsp chopped Fresh Dill for a vibrant, fresh finish.

Let the swordfish rest for 5 minutes before serving. This allows the juices to redistribute, ensuring each bite is moist and tender. Serve immediately with additional lemon wedges if desired.

Flavor Customization for These Flavors

Mediterranean Twist

Swap the Dijon Mustard for 1 tbsp chopped capers and add ½ tsp dried oregano to the marinade. The briny capers add a salty punch that pairs beautifully with swordfish. I love this combination after foraging wild oregano along the coast. 🌿

Spicy Cajun Style

Create a dry rub with 1 tsp smoked paprika, ½ tsp cayenne, and ½ tsp garlic powder instead of the marinade. Press it onto the steaks before grilling for a bold, smoky kick. This reminds me of my first BBQ competition where spice was king. 🔥

Citrus-Glazed Version

Mix 2 tbsp orange marmalade with 1 tbsp soy sauce and brush onto the swordfish during the last 2 minutes of grilling. The sugar caramelizes quickly, creating a sticky, sweet-savory crust that’s irresistible.

Herb-Crusted Approach

Combine ¼ cup breadcrumbs, 2 tbsp chopped Fresh Flat-Leaf Parsley, and 1 tbsp lemon zest. Press onto the steaks before grilling for a crispy, aromatic topping. Use panko for extra crunch.

This technique works best with slightly thicker cuts to prevent burning. 💫

Asian-Inspired Marinade

Replace the lemon-herb mix with 2 tbsp soy sauce, 1 tbsp grated ginger, and 1 tbsp honey. The umami depth from soy complements the swordfish’s richness perfectly.