Swordfish Steak Recipe: Grilled to Buttery, Flaky Perfection

There’s a reason swordfish steaks are a favorite among seafood lovers—they deliver meaty texture with a mild, buttery flavor that’s hard to resist. This method ensures each bite is tender and flaky without falling apart on the grill.

The key lies in high heat and precise timing. A hot grill sears the outside quickly, locking in moisture while creating a slightly charred crust. With just a few simple seasonings, the natural richness of the fish shines through.

You’ll end up with a perfect steak that’s golden on the outside and moist inside, ready to be served with a squeeze of lemon or your favorite herb butter. It’s a dish that feels restaurant-worthy but is surprisingly straightforward to master.

Pair with grilled vegetables or a light salad for a complete meal. Here’s how to achieve it every time.

Ingredients for Swordfish Steak

Fresh fish, bold seasonings, and a few extras for that perfect flaky bite.

The swordfish quality is non-negotiable here. Look for steaks with a vibrant, moist appearance—avoid any with brown edges or a fishy smell. Whole Foods or a trusted seafood counter is ideal, but most supermarkets carry it frozen (thaw overnight in the fridge). Thickness matters—1-inch steaks cook evenly without drying out. If they’re thicker, adjust timing accordingly.

No fresh dill? Dried dill at one-third the amount works, or sub in fresh tarragon for a different twist. Out of smoked paprika? Regular paprika plus a pinch of cayenne gets close. The herb butter can be made ahead and reheated gently—don’t let it boil. If you’re skipping the butter, a drizzle of high-quality olive oil and extra lemon works too.

Swordfish is best cooked the day you buy it (or the next day if frozen). Leftovers? Refrigerate for up to 2 days—reheat gently to avoid drying out. The herb butter keeps 1 week in the fridge or 3 months frozen.

Step-by-Step Instructions for Swordfish Steak

Here’s the method that guarantees perfectly flaky results every time you fire up the grill.

Step 1: Season and Marinate the Swordfish Steaks

Pat the 4 swordfish steaks completely dry with paper towels—this ensures a good sear. In a small bowl, mix the 1 tsp sea salt, 1 tsp black pepper, 1 tsp garlic powder, and 0.5 tsp smoked paprika.

Brush each steak with 1 tbsp of the olive oil (saving the rest for later), then coat evenly with the spice mixture. Let the steaks sit at room temperature for 15-20 minutes to allow the flavors to penetrate. This short rest makes a noticeable difference in flavor and texture.

Step 2: Prepare the Herb Butter

While the swordfish rests, make the herb butter. In a small saucepan, melt the 4 tbsp unsalted butter over low heat. Stir in the 1 tsp Dijon mustard, 2 tbsp fresh dill, and 0.25 tsp red pepper flakes.

Remove from heat and set aside. This compound butter adds richness and a bright, herby finish to the swordfish. The residual heat will gently infuse the flavors without cooking the herbs.

Step 3: Grill the Swordfish to Perfection

Preheat your grill to medium-high heat (about 400°F). Lightly oil the grates with the remaining 2 tbsp olive oil to prevent sticking. Place the swordfish steaks on the grill and cook undisturbed for 4-5 minutes per side.

Look for golden-brown grill marks and a slightly opaque center when flipping. Avoid pressing the steaks with your spatula—this squeezes out the natural juices. The swordfish is done when it flakes easily with a fork and reaches an internal temperature of 145°F.

Step 4: Rest and Finish with herb butter and Garnish

Transfer the grilled swordfish to a serving platter and immediately drizzle with the prepared herb butter. Let the steaks rest for 3-5 minutes—this allows the juices to redistribute, keeping each bite moist and flavorful.

Zest the 1 whole lemon over the top, then squeeze a little juice for brightness. Sprinkle with the 0.25 cup fresh parsley for a pop of color and freshness. Serve immediately while hot, with extra lemon wedges on the side if desired.

Best Sauces and Condiments for This swordfish steak

Herb Butter Drizzle

The herb butter from the recipe works beautifully as a sauce—drizzle it generously over each steak. For extra brightness, add 1 tbsp lemon juice to the melted butter before spooning it over the fish. I love how it pools around the edges. 🌟

Lemon-Caper Sauce

Combine ¼ cup capers, 2 tbsp lemon juice, 3 tbsp olive oil, and 1 minced garlic clove. The briny capers cut through the richness while the lemon adds a zesty kick. Spoon over steaks just before serving.

Garlic Aioli

Whisk ½ cup mayo with 1 tbsp Dijon mustard, 2 minced garlic cloves, and 1 tbsp lemon juice. This creamy sauce adds a luxurious finish. I often make extra for dipping grilled vegetables.

Salsa Verde

Blend 1 cup parsley, 2 tbsp capers, 1 garlic clove, ¼ cup olive oil, and 1 tbsp lemon juice. The fresh, herby flavors complement the swordfish perfectly. It’s my go-to for summer grilling. 💛

Teriyaki Glaze

Simmer ¼ cup soy sauce, 2 tbsp honey, 1 tbsp rice vinegar, and 1 tsp grated ginger until slightly thickened. Brush on during the last 2 minutes of grilling for a sweet-savory finish.

Simple Lemon Wedges

Never underestimate the power of fresh lemon. Serve with 4-6 lemon wedges per steak for a bright, acidic touch. A squeeze just before eating enhances all the other flavors beautifully.

Frequently Asked Questions