How To Cook A Swordfish Steak

ByLily

Swordfish steak holds its shape well on the grill, but its dense texture means you need to watch for dryness. Learning how to cook a swordfish steak correctly comes down to a few simple rules: high heat, short time, and a good marinade or oil rub.

This guide covers grilling, pan-searing, and broiling methods, plus seasoning tips and doneness checks that keep the fish juicy.

What You Need Before You Start

Swordfish is a firm, meaty fish. It behaves more like a pork chop than a flaky white fish, so treat it with a bit of care.

  • Steaks about 1 inch thick, skin removed
  • Olive oil or a light marinade
  • Salt and black pepper
  • Tongs and a spatula
  • Instant-read thermometer (optional but helpful)

Fresh steaks should smell clean and mild. If the fish smells strong or sour, skip it. Frozen steaks work fine too, just thaw them in the fridge overnight and pat them dry.

How To Cook A Swordfish Steak

You have three solid options. Pick the one that fits your kitchen and your mood.

Method 1: Grilling

Grilling gives swordfish a smoky crust and keeps the inside tender when done right.

  1. Heat your grill to medium-high, around 400 to 450 degrees Fahrenheit.
  2. Brush the steaks with olive oil and season both sides with salt and pepper.
  3. Oil the grill grates well so the fish does not stick.
  4. Place steaks on the grill and close the lid.
  5. Cook 4 to 5 minutes per side for a 1-inch steak.
  6. Flip once, using tongs or a spatula. Do not poke the fish with a fork.
  7. Pull the steaks off when the center reaches 130 to 135 degrees Fahrenheit.

Let the fish rest for 3 to 5 minutes before serving. The temperature will rise a few more degrees as it sits.

Method 2: Pan-Searing

No grill? A cast iron skillet works great and gives you more control.

  1. Pat the steaks completely dry with paper towels.
  2. Season with salt and pepper on both sides.
  3. Heat a tablespoon of oil in the pan over medium-high heat until it shimmers.
  4. Lay the steaks in the pan away from you to avoid splatter.
  5. Sear 3 to 4 minutes without moving them.
  6. Flip and cook another 3 to 4 minutes.
  7. Add a knob of butter and spoon it over the fish during the last minute.

This method gives a nice brown crust. Keep the heat at medium-high, not max, or the outside will burn before the inside cooks.

Method 3: Broiling

Broiling is fast and needs almost no cleanup. It is a good choice for a weeknight dinner.

  1. Set the oven rack about 6 inches from the top element.
  2. Turn the broiler on high.
  3. Line a sheet pan with foil and lightly oil it.
  4. Place seasoned steaks on the pan.
  5. Broil 5 to 6 minutes per side, flipping once.
  6. Check the center with a thermometer before removing.

Watch the fish closely near the end. Broilers vary a lot in power, and thin steaks can overcook in under a minute.

Seasoning Ideas That Work

Swordfish has a mild, slightly sweet flavor. It takes well to bold seasonings without getting overwhelmed.

  • Lemon juice, garlic, and olive oil
  • Soy sauce, ginger, and sesame oil
  • Smoked paprika, cumin, and lime
  • Fresh herbs like parsley, thyme, or oregano
  • Chili flakes for a bit of heat

Marinate for 30 minutes to 2 hours. Longer than that and the acid in the marinade starts to break down the flesh, which makes the texture mushy.

A Quick Note On Salt

Salt the steaks 15 to 20 minutes before cooking if you have time. This helps season the fish all the way through instead of just the surface.

How To Tell When It Is Done

Overcooking is the number one mistake with swordfish. Dry swordfish is tough and chewy.

  • 130 to 135 degrees Fahrenheit for medium-rare
  • 140 degrees Fahrenheit for medium
  • Anything past 145 degrees Fahrenheit will be dry

If you do not have a thermometer, press the fish with your finger. It should feel firm at the edges but still give slightly in the middle. A fork should slide in with light pressure, not a fight.

Common Mistakes To Avoid

  • Cooking cold fish straight from the fridge. Let steaks sit out 15 minutes first.
  • Skipping the oil. Swordfish is lean and sticks easily.
  • Flipping more than once. One flip is enough.
  • Using high heat the whole time. Medium-high is the sweet spot.
  • Cutting into the fish to check doneness. Use a thermometer instead so the juices stay inside.

Serving Suggestions

Swordfish pairs well with simple sides that do not compete with it. Grilled vegetables, rice pilaf, roasted potatoes, or a light salad all work. A squeeze of lemon or a spoon of salsa verde on top adds brightness.

Leftovers keep in the fridge for up to 2 days. Reheat gently in a covered pan over low heat, or eat it cold over greens. Reheating in the microwave tends to make it rubbery, so avoid that if you can.

Final Tips For Best Results

Buy steaks of even thickness so they cook at the same rate. Keep your seasonings simple. Cook hot and fast, and pull the fish a few degrees before your target temperature.

With a little practice, you will get a tender, juicy steak every time, whether it comes off the grill, the skillet, or the broiler.

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