A serving plate with three portions of grilled swordfish steaks topped with lemon basil butter, a grilling fork to the left and napkin beneath the plate.

Grilled Swordfish with Zesty Lemon-Basil Butter: Your Ultimate Guide to a Perfect Seafood Meal

For many home cooks, grilling fish can seem like a daunting task, often associated with delicate textures that might stick to the grates or fall apart. However, swordfish breaks this stereotype with its incredibly firm, steak-like texture, making it an ideal candidate for grilling. It’s robust enough to handle high heat, yet yields a moist, flaky interior when cooked correctly. This comprehensive guide will equip you with all the knowledge to master grilled swordfish, elevated by a simple yet irresistible lemon-basil compound butter that melts into every succulent bite, transforming a weeknight meal into a gourmet experience. Forget the fuss; achieve perfection on the grill every time, making grilled swordfish a staple in your culinary repertoire.

Why Choose Swordfish for Your Grill?

Swordfish is a top choice for grilling not just for its ease of preparation but also for its distinctive qualities that make it stand out among other seafood options. Its dense, meaty flesh holds up exceptionally well to the direct, high heat of a grill, ensuring it won’t flake apart or stick as easily as more delicate fish varieties. This firm texture also allows it to absorb marinades and seasonings beautifully, offering a depth of flavor that is truly remarkable. Unlike many other fish, swordfish maintains its integrity and shape throughout the grilling process, making it incredibly satisfying to cook and present. Beyond its culinary adaptability, swordfish is also a fantastic source of lean protein, essential vitamins (like B12 and D), and beneficial omega-3 fatty acids, contributing significantly to a healthy and balanced diet. When topped with a vibrant lemon-basil butter, the natural richness of the swordfish is perfectly balanced by bright, herbaceous notes, creating a dish that is both satisfyingly hearty and refreshingly light. Its versatility means it pairs well with a wide array of side dishes, from crisp salads to roasted vegetables, making it a go-to for any occasion.

Selecting the Freshest Swordfish Steaks

The success of any seafood dish begins with the quality of your ingredients, and swordfish is no exception. Knowing how to select fresh swordfish steaks is crucial for achieving the best flavor, texture, and overall dining experience. When shopping at your local fish market or grocery store, pay close attention to several key indicators. Look for steaks that range in color from a creamy white to a pale pink, with a slight translucence. Avoid any fish that appears dull, gray, yellowish, or has discolored spots, as these are signs of age. Many swordfish steaks will also feature a darker area of flesh running through them, often referred to as the “bloodline.” This is completely natural and harmless, but pay close attention to its color: a vivid reddish hue indicates superior freshness, while a brownish or muddy appearance suggests the fish is past its prime and should be avoided. Furthermore, a fresh swordfish steak should have a mild, clean, ocean-like aroma, not an overpowering or “fishy” smell that can indicate spoilage. The flesh itself should be firm and resilient to the touch, springing back immediately when gently pressed with a finger. Prioritizing these visual and olfactory cues will ensure you bring home the highest quality swordfish, setting the stage for an unforgettable grilled meal that truly shines.

Mastering the Grill: Essential Tips for Grilling Swordfish

Grilling swordfish to perfection requires a few simple, yet crucial, techniques that guarantee a tender, flavorful result every time. With its robust texture, swordfish is incredibly forgiving, making it an excellent choice for grill masters of all skill levels, even those new to cooking seafood over an open flame. Follow these indispensable tips to ensure your swordfish steaks are cooked impeccably, beautifully seared, and ready to be adorned with that irresistible lemon-basil butter.

Prepare Your Grill for Success: Always begin with a meticulously clean grill. Leftover food particles from previous cooks can cause the fish to stick mercilessly and can impart undesirable, burnt flavors to your delicate swordfish. Once clean, preheat your grill to a high temperature, typically between 450-550°F (230-290°C). A screaming hot grill is paramount; it creates a beautiful, deep sear on the exterior of the fish, which not only adds incredible flavor and texture but also helps to prevent sticking by cooking the surface quickly and locking in precious moisture. Allow the grates to heat for at least 10-15 minutes before placing the fish to ensure even heat distribution.
Seasoning for Enhanced Flavor: Swordfish boasts a naturally mild, yet rich flavor, which can be wonderfully enhanced with minimal, well-chosen seasoning. Before grilling, take your swordfish steaks and drizzle them generously with fresh lemon juice. Allow it to sit for a minute or two; the acidity from the lemon helps tenderize the fish slightly and significantly brightens its overall taste. Next, rub both sides of each steak thoroughly with a good quality extra virgin olive oil. This not only adds a lovely Mediterranean flavor but also helps create a crucial protective barrier on the fish, further preventing it from adhering to the grill grates. Finally, season liberally with coarse salt and freshly ground black pepper to taste. These simple seasonings are all you need to let the swordfish’s natural goodness shine without overpowering it.
The Double-Oil Technique for Non-Stick Grilling: While oiling the fish itself is a vital step, don’t overlook the importance of oiling your grill grates too! This “double-oil” method is a true secret weapon against sticking, ensuring your swordfish releases cleanly and effortlessly. Once your grill is preheated to its high temperature and the grates are clean, use a folded paper towel dipped in a high-smoke-point oil (such as vegetable, canola, or grapeseed oil) held securely with long tongs. Generously coat the hot grates, making sure to cover all the areas where the fish will sit. This creates an extra layer of non-stick protection, guaranteeing your swordfish develops those coveted grill marks and comes off the grill in one perfect piece.
Precision Grilling for Perfect Doneness: Swordfish steaks cook remarkably quickly due to their density and thickness, often in under ten minutes total cooking time. The absolute key is to grill them until they are opaque all the way through, but critically, without overcooking. Overcooked swordfish can quickly become dry, tough, and rubbery, losing its appealing steak-like texture. For typical 1-inch thick steaks, aim for approximately 3-1/2 to 4-1/2 minutes per side. The exact timing will, of course, vary based on your specific grill’s temperature, the thickness of your steaks, and your desired doneness. Therefore, visual cues are important: the flesh should turn from translucent to a solid, opaque white, and it should flake easily with a fork when tested at its thickest part. Avoid the temptation to move the fish too early; let it develop a nice, golden-brown crust before flipping to ensure maximum flavor and ease of turning.
The Finishing Touch: Compound Butter: A compound butter is an absolute game-changer for grilled swordfish, transforming it from a delicious meal into an extraordinary culinary experience. Prepared beforehand, this richly flavored butter melts decadently over the hot fish just as it comes off the grill, instantly infusing it with extra moisture, luxurious richness, and an explosion of complementary fresh flavors. Our lemon-basil compound butter is specifically designed to perfectly complement the natural sweetness and texture of the swordfish, adding a zesty, herbaceous note that elevates the entire dish. Don’t skip this relatively simple step – it’s what truly transforms a good grilled fish into an unforgettable one, delivering a final flourish of gourmet taste and texture.

A grilled swordfish steak with melted butter and chopped basil, garnished with a lemon wedge and sprig of basil, sautéed spinach in the background.

Crafting the Irresistible Lemon-Basil Butter

While the grilled swordfish itself is undoubtedly the star of this dish, the vibrant lemon-basil compound butter is its indispensable co-star, elevating the meal from great to truly exceptional. This simple addition provides an instant burst of fresh flavor, a luxurious texture, and much-needed moisture to complement the perfectly cooked fish. The beauty of compound butter lies in its ease of preparation and the ability to make it ahead of time, allowing you to focus on the grilling when your attention is most needed. The bright, tangy acidity of fresh lemon zest and juice cuts through the richness of the butter and the meaty swordfish, providing a refreshing counterpoint. Meanwhile, fresh basil, with its distinctive aromatic and slightly peppery notes, adds a fragrant, herbaceous layer that is both comforting and sophisticated. A subtle hint of minced garlic further deepens the savory profile, creating a harmonious blend of flavors that melts beautifully over the hot, grilled swordfish, infusing every fiber with delectable taste. Preparing this compound butter takes mere minutes of effort, but its impact on the final dish is profound, showcasing how simple, high-quality ingredients, thoughtfully combined, can create culinary magic. It’s the finishing touch that ties all the elements of this outstanding grilled swordfish recipe together.

Frequently Asked Questions About Swordfish

How do I tell if swordfish is fresh?

When selecting swordfish, freshness is paramount. Look for steaks that are firm to the touch, not mushy, and have a clean, mild ocean scent – never an overly “fishy” or ammonia-like odor. The flesh should exhibit a creamy white to pale pink color, appearing bright and moist. A common feature in swordfish steaks is a darker area known as the “bloodline”; for peak freshness, this line should be reddish rather than brown or grey. Ensure there are no dull, grey, or discolored patches on the fish, as these are clear indicators of diminished quality.

Is swordfish considered sustainable?

Concerns about sustainability are increasingly important when making seafood choices. The good news is that most swordfish harvested from US and Canadian waters is widely recognized as sustainably fished. These populations are generally well-managed and caught using methods that minimize environmental impact. Organizations like SeafoodWatch.org are excellent resources that provide up-to-date recommendations, encouraging consumers to make responsible choices that support healthy ocean ecosystems and sustainable fishing practices. Always check for certifications or sourcing information if available to ensure you’re making an eco-friendly choice.

Can swordfish be served rare or medium like salmon or tuna?

Unlike some other firm-fleshed fish such as salmon or certain types of tuna, swordfish should generally be cooked until it is opaque all the way through. While you want it thoroughly cooked for both safety and optimal texture, it is absolutely crucial to watch it carefully to avoid overcooking. Overcooked swordfish can quickly become dry, tough, and fibrous, losing its desirable moist, steak-like appeal. For perfect doneness, aim for an internal temperature of 130-135°F (54-57°C) when measured at the thickest part with an instant-read thermometer, keeping in mind that there will be a few degrees of carryover cooking once removed from the grill.

Can you eat the skin on swordfish?

The skin on swordfish is notably thick, leathery, and tough, making it generally unpalatable for eating. While we highly recommend grilling swordfish with the skin on – as it serves a beneficial purpose by helping to protect the delicate flesh from the direct heat of the grill, prevents sticking, and locks in valuable moisture during the cooking process – it should always be removed and discarded before serving. Fortunately, once the fish is cooked, the skin typically peels away easily, revealing the perfectly moist and flaky interior ready for enjoyment.

What are good side dishes to serve with grilled swordfish?

Grilled swordfish, especially with its bright lemon-basil butter, pairs wonderfully with a wide variety of light, fresh, and vibrant side dishes that complement its rich flavor without overpowering it. Consider serving it alongside a crisp green salad dressed with a light vinaigrette, elegantly roasted asparagus or tender steamed broccoli, or a medley of grilled vegetables such as zucchini, bell peppers, or cherry tomatoes. For a heartier option, lemon rice, couscous salad, or a simple quinoa salad would also complement the flavors beautifully, offering a refreshing contrast to the richness of the fish. These sides help create a balanced and satisfying meal.

What are the health benefits of eating swordfish?

Swordfish is not only delicious but also a powerhouse of nutrition, offering significant health benefits. It’s an excellent source of high-quality, lean protein, which is essential for muscle repair, growth, and overall bodily functions. Moreover, it’s rich in beneficial Omega-3 fatty acids (EPA and DHA), known for supporting heart health, reducing inflammation, and boosting brain function. Swordfish also provides a substantial amount of essential vitamins and minerals, including Vitamin D (crucial for bone health and immunity), Selenium (a powerful antioxidant), and Niacin (Vitamin B3, important for energy metabolism). Incorporating swordfish into your diet can be a delicious and effective way to boost your nutrient intake and support your overall well-being.

More Delicious Grilled Fish Recipes to Explore

Swordfish Spiedini with Lemon Garlic Crumbs: For those who appreciate a unique preparation, this Mediterranean-inspired take on swordfish features tender cubes skewered and coated with savory lemon-garlic breadcrumbs, grilled to perfection.
Soy Grilled Mahi Mahi (from Kalyn’s Kitchen): If you’re looking for an alternative firm-fleshed fish with an Asian-inspired twist, this Mahi Mahi recipe offers a fantastic, flavorful option with a savory soy marinade.
Grilled Salmon with Lemon and Dill: A timeless and universally loved grilled fish recipe, featuring the rich, buttery flavor of salmon perfectly complemented by fresh lemon and fragrant dill, ideal for any occasion.
Spicy Grilled Shrimp Skewers: While not a fish, these succulent, spicy shrimp skewers are a fantastic grilled seafood option, perfect as an appetizer for a crowd or a light main course, offering a zesty kick.

Grilled Swordfish with Lemon-Basil Butter

By
Lynne Webb

This grilled swordfish recipe is a testament to how simple ingredients can create an extraordinarily flavorful and elegant meal. Featuring firm, succulent swordfish steaks perfectly grilled to tender perfection and topped with a luscious, aromatic lemon-basil compound butter, it’s a quick, impressive, and fuss-free dish that’s sure to impress any palate. Ideal for a speedy weeknight dinner, a sophisticated weekend barbecue, or a special occasion when you want to enjoy fresh, high-quality seafood with minimal effort.

Prep:
10 minutes

Cook:
10 minutes

Total:
20 minutes

Servings:
4 servings

Pin Recipe
Rate Recipe
Print Recipe

Ingredients

2 swordfish steaks, approximately 1-inch thick (about 2 lbs total weight)
Juice of 1/2 lemon, freshly squeezed
Extra virgin olive oil, for rubbing and oiling grates
Salt and freshly ground black pepper, generously to taste

For the lemon-basil butter:

4 tablespoons unsalted butter, softened to room temperature
1 teaspoon freshly squeezed lemon juice
Zest of 1 whole lemon, finely grated for maximum flavor
1/2 teaspoon garlic, minced very finely (roughly 1/2 clove)
1/4 teaspoon salt, or to taste
2 tablespoons minced fresh basil, packed

To easily refer back to this delicious recipe, we recommend bookmarking this page in your browser or printing it for your personal recipe collection!

Instructions

1. Prepare the Grill: Begin by preheating your gas or charcoal grill to a high temperature, aiming for roughly 450-550°F (230-290°C). It is crucial to start with impeccably clean grill grates to prevent the fish from sticking.
2. Season the Swordfish: If your swordfish steaks are exceptionally large, you may cut each steak in half for easier handling and more even cooking. Drizzle them generously with the juice of 1/2 lemon and allow them to rest for 1 minute so the lemon flavor can begin to penetrate the flesh. Subsequently, rub both sides of each steak with a good amount of extra virgin olive oil, then season liberally with salt and freshly ground black pepper. Set the seasoned fish aside while you prepare the compound butter.
3. Prepare the Lemon-Basil Butter: In a small, clean bowl, combine the softened unsalted butter, 1 teaspoon of freshly squeezed lemon juice, the finely grated zest of 1 whole lemon, the minced garlic, and 1/4 teaspoon of salt. Mix all ingredients thoroughly with a fork or spatula until they are well incorporated and evenly distributed. Finally, fold in the minced fresh basil. Set this flavorful compound butter aside at room temperature until it’s time to serve. If you’ve prepared it in advance and refrigerated it, ensure you bring it back to room temperature before serving to allow it to melt beautifully over the hot fish.
4. Grill the Swordfish: Once your grill is piping hot and the grates are clean, carefully oil the grates using tongs and a paper towel dipped in a high-smoke-point oil (like canola or vegetable oil). Place the seasoned swordfish steaks directly onto the hot, oiled grates. Grill the swordfish steaks until they are opaque all the way through, which typically takes about 3-1/2 to 4-1/2 minutes per side for steaks that are 1-inch thick. It’s important to resist the urge to move the fish too early, allowing it to develop a beautiful sear. Continuously monitor the fish to prevent overcooking, as this will lead to a dry and tough texture.
5. Serve with Butter: As soon as the perfectly grilled swordfish comes off the grill, transfer it immediately to individual serving plates. Top each piece of fish with approximately 1 tablespoon of the prepared lemon-basil butter. The residual heat from the hot swordfish will perfectly melt the butter, creating a delectable, aromatic sauce that will infuse the fish with incredible flavor. Allow the fish to rest for 3 minutes before serving; this crucial resting period allows the juices to redistribute, resulting in a more tender and flavorful eating experience.

Recipe Notes and Expert Tips

Start with Fresh Fish for Best Results: As emphasized, the quality of your swordfish makes all the difference. Always seek out steaks that are firm, moist, and possess a mild ocean scent. A vibrant reddish “bloodline” within the steak is your best indicator of peak freshness.
Achieve Perfect Doneness Without Drying Out: Swordfish should be cooked until it is completely opaque throughout. To achieve this without drying it out, an instant-read meat thermometer is your best friend. Aim for an internal temperature of 130-135°F (54-57°C) when inserted into the thickest part of the steak. Remember that the fish will continue to cook slightly (carryover cooking) after it’s removed from the heat.
Grill with Skin On, but Don’t Eat It: The skin on swordfish is remarkably tough and not meant for consumption. However, leaving it on during the grilling process serves a valuable purpose: it helps protect the delicate flesh from drying out and sticking to the grates, acting as a natural barrier. Once cooked, the skin can be easily peeled off and discarded before serving.
Make Ahead Tip for the Compound Butter: The lemon-basil compound butter is a fantastic component that can be prepared several days in advance. Simply mix all the ingredients, form it into a log using parchment paper or plastic wrap, and store it in the refrigerator. Remember to bring it back to room temperature for about 30 minutes before serving, ensuring it melts beautifully over the hot fish.
Consider Different Herb Combinations: While lemon and basil create a classic pairing, feel free to experiment with other fresh herbs for your compound butter. Fresh dill, parsley, chives, or a combination of these can also create wonderful flavor profiles that complement swordfish beautifully.

Nutrition Information (Approximate per serving)

Calories: 564,
Total Fat: 33g,
Cholesterol: 207mg,
Sodium: 465mg,
Carbohydrates: 11g,
Fiber: 1g,
Sugar: 8g,
Protein: 54g

Nutrition information is automatically calculated and is provided as an estimate. It should be used for informational purposes only and may vary based on specific ingredients and preparation methods.

Love this recipe? Share your thoughts below!
Your ratings and comments help other home cooks discover delicious meals and perfect their grilling skills.

Conclusion: Your Go-To Grilled Swordfish Recipe

Grilling swordfish, once perhaps perceived as a challenging or intimidating culinary endeavor, is now firmly within your grasp with this comprehensive guide. By diligently following these straightforward yet expert tips for selecting the freshest fish, meticulously preparing your grill, seasoning with careful consideration, and understanding the precise cooking times, you can consistently achieve moist, incredibly flavorful swordfish steaks that rival any restaurant dish. The thoughtful addition of the vibrant, zesty lemon-basil compound butter is truly the crowning glory, effortlessly transforming a simple grilled fish into a memorable meal that is both exceptionally healthy and utterly delicious. Whether you’re a seasoned grill master looking to perfect your seafood technique or just embarking on your exciting grilling journey, this recipe provides a foolproof and enjoyable method to savor exquisite swordfish at home. Gather your fresh ingredients, confidently fire up the grill, and prepare to delight your taste buds with one of the finest seafood dishes you can possibly make, knowing you’ve mastered the art of grilled swordfish.