Grilled Swordfish with Lemon Herb Sauce for Thick Steaks
- Time: 15 min active + 30 min marinating/resting
- Flavor/Texture Hook: Zesty, bright citrus with a firm, meaty char
- Perfect for: Fast weeknight dinners or summer hosting
Table of Contents
Grilled Swordfish with Lemon Herb Sauce
The loud hiss of a gas grill on a Friday night always signals the weekend for me. There is something about that specific sound when a thick swordfish steak hits the grate that just feels right. I used to treat swordfish like a delicate fillet, but it's basically the steak of the sea.
It handles the heat and takes on a charred, mahogany crust that is just brilliant.
This Grilled Swordfish with Lemon Herb Sauce is my go to when I want something that feels fancy but doesn't keep me in the kitchen for hours. The beauty is in the sauce, which doubles as a quick marinade and a finishing glaze.
It cuts through the richness of the fish with a sharp, citrusy punch that wakes everything up.
You can expect a meal that's lean, filling, and bright. It doesn't need a lot of fuss, just a hot grill and a few fresh herbs. Trust me on this don't overthink the timing, or you'll end up with something resembling a rubber eraser.
Quick Recipe Specs
Getting this on the table is all about the flow. Since you're using a gas grill, you can get to temperature quickly. The 45 minute total time includes the window where the fish sits in the marinade and the final rest, which is where the magic happens.
For the best results, make sure your steaks are exactly 1 inch thick. Anything thinner overcooks in a blink, and anything thicker takes too long to hit that internal 145°F without burning the outside.
Why This Recipe Works
- Citrus Tenderizing: The lemon juice in the marinade lightly softens the surface proteins, which helps the garlic and oregano stick to the meat instead of sliding off.
- Residual Heat: Pulling the fish at 130°F prevents the proteins from tightening too much, allowing the carryover heat to finish the job gently.
If you aren't in the mood for the grill, my pan seared swordfish guide uses a similar flavor profile but handles the heat differently.
| Method | Time | Texture | Best For |
|---|---|---|---|
| Gas Grill | 10 mins | Charred & Smoky | Summer outdoors |
| Cast Iron | 12 mins | Deep Brown Crust | Rainy weeknights |
| Oven Broil | 15 mins | Evenly Roasted | Large batches |
Gathering Your Essentials
I prefer using fresh parsley over dried because the brightness is non negotiable here. If you're in a rush, dried oregano works, but you'll lose that punchy, garden fresh vibe.
For the Swordfish
- 4 (6 oz / 170g) swordfish steaks, 1 inch thick Why this? Consistent thickness ensures even cooking
- 2 tbsp (30ml) extra virgin olive oil
- 1 tsp (6g) kosher salt
- ½ tsp (1g) freshly cracked black pepper
For the Lemon Herb Sauce
- ⅓ cup (80ml) extra virgin olive oil
- 3 tbsp (45ml) fresh lemon juice Why this? Fresh acid cuts through the fatty fish
- 1 tbsp (6g) lemon zest
- 3 cloves (15g) garlic, minced
- 2 tbsp (8g) fresh parsley, finely chopped
- 1 tbsp (3g) fresh oregano, minced
- ¼ tsp (0.5g) red pepper flakes
| Ingredient | Role | If You Don't Have It |
|---|---|---|
| Swordfish | Main Protein | Halibut or thick Tuna steaks |
| Fresh Oregano | Earthy Note | Dried oregano (use 1 tsp) |
| Lemon Zest | Concentrated Aroma | Extra lemon juice (though less fragrant) |
| Red Pepper Flakes | Subtle Heat | A pinch of cayenne or paprika |
Tools You Will Need
Certain tools make this process much smoother, though most are optional. The only absolute requirement is a digital meat thermometer; trying to eyeball the doneness of swordfish is usually a losing bet.
- Gas or charcoal grill
- Small whisk and mixing bowl
- Paper towels (for drying the fish)
- Instant read digital thermometer
- Tongs (avoid using forks so you don't pierce the meat)
Simple Cooking Steps
- Whisk the sauce. Combine the ⅓ cup olive oil, lemon juice, zest, garlic, parsley, oregano, and red pepper flakes in a small bowl.
- Split the mixture. Pour half the sauce into a separate container for later. Use the other half to coat your swordfish steaks.
- Marinate briefly. Let the fish sit in the sauce for 10-15 minutes. Note: Don't go longer or the lemon juice will start "cooking" the fish.
- Heat the grill. Set your grill to medium high (approx. 400°F / 204°C). Clean the grates and rub them with oil.
- Prep the steaks. Pat the swordfish steaks dry with paper towels and season with salt and pepper. Note: Drying the surface is what creates that mahogany crust.
- Sear the fish. Grill for 4-5 minutes per side. Cook until you see deep grill marks and the meat feels firm.
- Check the temp. Pull the steaks off the grill when they hit 130°F (54°C) internally.
- Glaze and rest. Spoon the reserved lemon herb sauce over the hot fish. Let them rest for 5 minutes until the internal temperature reaches 145°F (63°C).
Fixing Common Cooking Issues
The most annoying thing about swordfish is how it loves to stick to the grill. Because it's a denser meat, it doesn't release as easily as a salmon fillet might. If you see the fish tearing when you try to flip it, you've probably tried to move it too soon.
Another common slip up is the "rubber effect." This happens when you cook the fish straight to 145°F on the grill. By the time you plate it, the carryover heat pushes it to 155°F or higher, leaving you with a chewiness that's hard to swallow.
Preventing Sticking
Make sure your grill is screaming hot before the fish goes on. Use a folded paper towel dipped in oil to lube the grates right before you lay the steaks down.
Avoiding Overcooking
Use the 130°F pull rule. The resting period is not just for the sauce, it's to let the heat distribute evenly without toughening the fibers.
| Problem | Root Cause | Solution |
|---|---|---|
| Fish sticks to grill | Grates too cold or not oiled | Preheat to 400°F and oil grates |
| Rubbery texture | Cooked past 145°F | Pull at 130°F and let rest |
| Sauce is too oily | Poor whisking | Whisk vigorously before spooning |
| No char/browning | Fish was too wet | Pat dry with paper towels before seasoning |
Preservation Secrets
If you have leftovers, store them in a glass container with a bit of the extra sauce on top. This keeps the fish from drying out in the fridge. It'll stay good for about 2 days. Honestly, swordfish isn't great when reheated in a microwave, as it turns rubbery again.
I recommend eating leftovers cold over a salad or gently warming them in a pan with a splash of water.
For zero waste, don't toss your lemon halves. Squeeze every last drop into the sauce, then toss the spent rinds into a jar with white vinegar to make a quick citrus cleaner for your counters.
Customizing Your Fish
For a Mediterranean twist, add some halved kalamata olives and a sprinkle of feta cheese to the platter. If you want a spicy kick, double the red pepper flakes or add a teaspoon of sriracha to the reserved sauce.
For a creamy finish, whisk a tablespoon of Greek yogurt into the reserved lemon herb sauce before spooning it over the fish. It creates a silky texture that balances the acidity of the lemon.
| Goal | Adjustment | Result |
|---|---|---|
| More Heat | Add ½ tsp cayenne | Spicy, bold finish |
| Brighter Flavor | Add 1 tsp capers | Salty, tangy pop |
| Nuttier Taste | Swap olive oil for browned butter | Richer, bistro style sauce |
If you prefer a different herb profile, try my With Pesto for 4 recipe for a more basil forward approach.
Great Side Dish Pairings
This Grilled Swordfish with Lemon Herb Sauce is quite lean, so I like to pair it with something that has a bit of substance. A heap of garlic sauteed spinach or roasted asparagus works perfectly because they share the same bright, clean notes as the lemon sauce.
If you're feeding a crowd, a wild rice pilaf or a quinoa salad with cucumbers and cherry tomatoes keeps the meal light. For a more indulgent vibe, some smashed fingerling potatoes with sea salt provide a great textural contrast to the firm fish.
Recipe FAQs
What sauce goes well with grilled swordfish?
A bright, citrus based herb sauce is the best choice. The acidity from lemon juice and zest cuts through the meaty richness of the fish, while fresh parsley and oregano add earthy depth.
How can swordfish steaks be cooked to avoid dryness?
Pull the fish off the heat at 130°F. Let the steaks rest for 5 minutes to reach a final internal temperature of 145°F, which prevents the proteins from tightening and squeezing out moisture.
How to grill swordfish steaks properly?
Preheat your grill to 400°F and oil the grates. Grill the seasoned steaks for 4 5 minutes per side until they develop a charred crust and reach the target internal temperature.
Is it true that swordfish is too risky to eat?
No, and here's why. While it contains more mercury than some smaller fish, it is perfectly safe for most adults to enjoy in moderation as part of a varied diet.
Which vegetables pair best with these steaks?
Charred summer vegetables provide a great textural contrast. If you mastered the high heat sear on the fish, apply that same technique to these outdoor grilled vegetables.