How to Cook Perfect Ahi Tuna Steaks from Costco

Ahi tuna steaks from Costco can make for an easy, delicious weeknight dinner. The key is knowing how to prep and cook these thick tuna steaks for the best flavor and texture. With just a few simple steps, you’ll have restaurant-quality tuna ready in under 15 minutes.

As a busy mom, I love grabbing a couple vacuum-sealed ahi tuna steaks from the Costco frozen section for a quick protein. It defrosts easily in the fridge overnight. Then I whip up a flavorful marinade and sear the tuna to juicy, medium-rare perfection.

These techniques guarantee melt-in-your-mouth ahi tuna steaks bursting with flavor. Keep reading for my fail-proof method for cooking frozen tuna steaks from Costco.

Ingredients for Ahi Tuna Steaks

• 2 ahi tuna steaks (1 lb each)
• 2 Tbsp soy sauce
• 2 Tbsp olive oil
• 1 Tbsp honey
• 1 garlic clove, minced
• 1/4 tsp black pepper
• Pinch of crushed red pepper flakes
• Lime wedges, for serving
• Fresh cilantro, chopped, for serving

Step-by-Step Instructions

Defrost:

1. Place frozen ahi tuna steaks on a plate in the fridge for 24 hours to thaw completely.

Marinate:

1. In a small bowl, whisk together the soy sauce, olive oil, honey, garlic, black pepper, and red pepper flakes.

2. Pour the marinade over the tuna steaks, flipping to coat both sides. Let marinate 15-20 minutes.

Sear:

1. Heat a cast iron or nonstick skillet over high heat until very hot.

2. Remove tuna from marinade and place in hot pan. Sear 2-3 minutes per side until browned.

Finish:

1. Remove tuna to a cutting board and slice into 1/2″ pieces. Serve with lime wedges and cilantro.

It’s that simple to make restaurant-quality ahi tuna steaks at home with Costco tuna!

Helpful Tips for Cooking Costco Ahi Tuna

Follow these tips for perfect, juicy ahi tuna steaks every time:

• Pat tuna dry before searing to help it brown better. Wet meat won’t sear as nicely.

• Use a nonstick pan or well-seasoned cast iron skillet to prevent sticking.

• Get the pan very hot before adding tuna so it sears vs steams

• Flip tuna only once during cooking for best sear.

• For rare tuna sear 1-2 minutes per side. For medium-rare go 2-3 minutes.

• Let tuna rest 3 minutes before slicing to allow juices to redistribute.

• Slice tuna across the grain for most tender texture.

• Add crunchy toppings like sesame seeds, green onion, or fried shallots.

Make a Delicious Sauce

Drizzle your seared ahi tuna steaks with one of these easy homemade sauces:

• Soy ginger dressing – Whisk together soy sauce, olive oil, ginger, and garlic.

• Wasabi mayo – Mix mayonnaise, lime juice, wasabi powder, and sriracha.

• Ponzu – Stir together ponzu sauce, lime juice, sesame oil, and chilies.

• Spicy mayo – Combine mayo, sriracha, rice vinegar, sesame oil, and garlic.

• Peanut sauce – Whisk together peanut butter, soy sauce, lime, ginger, and garlic.

What to Serve with Ahi Tuna

Here are some tasty options for sides and full meals:

• Rice bowls – Serve tuna over sushi rice or cauliflower rice with avocado.

• Tuna tataki – Top tuna with ponzu sauce and grated daikon radish.

• Soba noodle salad – Toss chilled soba noodles with sesame dressing and tuna.

• Tuna tacos – Stuff seared tuna in corn tortillas with cabbage slaw.

• Tuna poke – Dice tuna and mix with diced mango, seaweed, and ponzu sauce.

• Niçoise salad – Serve seared tuna over mixed greens, green beans, tomatoes, and potatoes.

With an easy marinade and quick sear, these Costco ahi tuna steaks are restaurant-quality. Play around with global flavor combinations to take this healthy weeknight dinner up a notch. Your family will be asking for these tuna steaks again and again!