Recipe Swordfish Steak: Grill-Marked with Lemon-Herb Butter

This swordfish steak recipe delivers restaurant-quality results with a simple yet refined approach. The key lies in achieving perfect grill marks while keeping the fish tender and moist.

A lemon-herb butter adds brightness and richness, complementing the fish’s natural flavor. The technique ensures the steaks cook evenly without drying out, making it accessible for home cooks.

High heat and precise timing create those coveted char marks while maintaining a flaky interior. The butter melts beautifully over the hot steaks, infusing every bite with aromatic depth.

Serve immediately for the best texture and flavor. This method highlights the fish’s natural elegance with minimal effort.

Ingredients for Recipe Swordfish Steak

Restaurant-quality swordfish requires just these fresh, simple ingredients for perfect results every time.

The swordfish is the star—sourced from reputable seafood markets or the fish counter at Whole Foods. Look for steaks with a vibrant, moist appearance and no fishy odor. Thickness matters: aim for 1-inch steaks for even cooking. For the butter, European-style unsalted (like Plugrá) has higher fat content, which means better browning and flavor. Fresh herbs are non-negotiable for the lemon-herb butter—dried won’t deliver the same aromatic punch.

Out of dill? Fresh tarragon or chives work well as substitutes. No shallots? Red onion at half the amount will do. If you can’t find swordfish, halibut or mahi-mahi are solid alternatives—they hold up to high heat similarly. The olive oil should have a neutral flavor and high smoke point (avoid extra-virgin for searing). For citrus, lime juice can replace lemon in a pinch, though the flavor profile will shift slightly.

Swordfish steaks are best cooked immediately after purchasing but can be stored in the fridge for up to 1 day. The lemon-herb butter can be made 2 days ahead and stored in the fridge—bring it to room temperature before using. Leftovers (if any) keep for 2-3 days in the fridge, though swordfish is ideal served fresh off the grill.

Step-by-Step Instructions for Swordfish Steak

Master the technique for perfectly grilled swordfish with vibrant herb butter every time.

Step 1: Prepare the Lemon-Herb Butter

In a small bowl, combine the 0.5 cup unsalted butter with 2 tbsp fresh lemon juice, 0.25 cup fresh parsley, 2 tbsp fresh dill, 1 tbsp fresh thyme, 3 cloves garlic cloves, and 1 whole shallot. I use a fork to thoroughly blend these ingredients, ensuring the herbs and aromatics are evenly distributed throughout the butter.

Season the mixture with ½ tsp kosher salt and ½ tsp freshly ground black pepper. This compound butter will melt beautifully over the hot swordfish, infusing every bite with bright, herbal notes. Set it aside at room temperature while you prepare the fish.

Step 2: Season and Prep the Swordfish Steaks

Pat the 1.5 lb swordfish steaks completely dry with paper towels. Moisture on the surface prevents proper searing and grill marks. Season both sides generously with the remaining 1 tsp kosher salt and ½ tsp freshly ground black pepper.

Let the seasoned steaks sit at room temperature for 10-15 minutes before cooking. This brief rest allows the salt to penetrate the surface, enhancing flavor and ensuring even cooking throughout the thick steaks.

Step 3: Sear the Swordfish to Perfection

Heat a grill or grill pan over medium-high heat until very hot. Brush the grates lightly with 2 tbsp olive oil to prevent sticking. Place the swordfish steaks on the grill and cook undisturbed for 4-5 minutes per side.

You’ll know it’s time to flip when the steaks develop distinct grill marks and release easily from the grates. The fish should be opaque and flake easily when tested with a fork. Avoid overhandling, as swordfish is delicate when cooking.

Step 4: Finish with Lemon-Herb Butter and Serve

Transfer the grilled swordfish steaks to a serving platter. Immediately top each steak with a generous dollop of the lemon-herb butter, allowing it to melt over the hot fish. The residual heat will cause the butter to cascade down the sides, creating a glossy, aromatic finish.

Garnish with 4 pieces lemon wedges for serving. The bright acidity cuts through the richness of the fish and butter, balancing each bite perfectly. Serve immediately while the swordfish is hot and the butter is still melting.

Perfect Pairings for This recipe swordfish steak

Wine Pairings

A crisp Sauvignon Blanc from New Zealand pairs beautifully, with its citrus notes complementing the lemon-herb butter. I love Kim Crawford for its bright acidity that cuts through the richness perfectly. 🍷

Side Dish Ideas

Grilled asparagus with a squeeze of lemon mirrors the fish’s charred notes. Toss 1 lb asparagus with 1 tbsp olive oil and grill for 3-4 minutes. Alternatively, a simple couscous salad with cherry tomatoes adds freshness.

Beer Options

A light, citrusy wheat beer like Blue Moon works wonderfully. The orange peel notes harmonize with the lemon in your dish. For something darker, a pilsner offers crisp contrast without overpowering the fish. 🍺

Vegetable Pairings

Roasted fingerling potatoes with rosemary provide a hearty base. Toss 1.5 lbs potatoes with 2 tbsp olive oil and roast at 400°F for 25 minutes. Their earthy flavor grounds the meal beautifully.

Bread Options

A crusty baguette or ciabatta is ideal for soaking up the melted herb butter. Warm slices briefly in the oven at 350°F for 5 minutes. I prefer sourdough for its tangy contrast to the rich fish.

Frequently Asked Questions