Seared Ahi Tuna

Seared ahi tuna cooked rare in a hot cast iron skillet and served with a wasabi–Greek yogurt smear, ginger–soy drizzle, crisp cucumber ribbons, and watermelon radish. An exact, restaurant-style seafood dish designed around timing and contrast.

Course Main Course

Cuisine Japanese-Inspired, Seafood

Keyword ahi tuna steak recipe, cast iron tuna, rare ahi tuna, seared ahi tuna, sushi-grade tuna

Prep Time 20

Cook Time 4

Resting 2

Total Time 26

Servings

Calories 472kcal

Author Cathy Pollak

Equipment

cast iron skillet Retains high heat for fast exterior carmelization without overcooking the center.
Chef's knife Essenital for precise slicing.
mixing bowls For the sauces.
Y-peeler For the cucumber ribbons.

Ingredients

Wasabi-Greek Yogurt Smear:

¼ cup (60 g) full-fat Greek yogurt I prefer full-fat Fage.
½-1 tsp (3-6 g) wasabi paste to taste
1 tsp (5 ml) fresh lime juice
pinch kosher salt

Ginger-Soy Drizzle:

3 tbsps (45 ml) low sodium soy sauce
1 tbsp (15 ml) rice vinegar
1 tbsp (21 g) honey or maple syrup
1 tsp (5 g) freshly grated ginger
1 tsp (5 ml) toasted sesame oil

Cucumber Ribbon Salad:

1 large English cucumber
pinch kosher salt
1 tbsp (15 ml) rice vinegar
1 tsp (7 g) honey or granulated sugar
1 tsp (5 ml) toasted sesame oil

Ahi Tuna:

1 large (12-14 oz / 340-400 g) ahi tuna steak sushi grade
kosher salt
2 tsps (10 ml) avocado oil or canola oil
watermelon radish thinly sliced, for serving
black sesame seeds for serving
white sesame seed for serving

Instructions

Whisk the Greek yogurt, wasabi paste, fresh lime juice, and a pinch of kosher salt in a small bowl until completely smooth and thick but spreadable. Cover and refrigerate until ready to use.
¼ cup (60 g) full-fat Greek yogurt, ½-1 tsp (3-6 g) wasabi paste, 1 tsp (5 ml) fresh lime juice, pinch kosher salt
In a separate bowl, whisk together the soy sauce, rice vinegar, honey or maple syrup, freshly grated ginger, and toasted sesame oil until fully combined. Set aside to allow the ginger to infuse while you prepare the remaining components.
3 tbsps (45 ml) low sodium soy sauce, 1 tbsp (15 ml) rice vinegar, 1 tbsp (21 g) honey, 1 tsp (5 g) freshly grated ginger, 1 tsp (5 ml) toasted sesame oil
Using a Y-peeler, shave the English cucumber lengthwise into long ribbons, stopping when you reach the seedy center. Place the ribbons in a bowl, sprinkle lightly with kosher salt, and let sit for 5 minutes. Gently squeeze out excess moisture, then toss with the rice vinegar, honey or sugar, and toasted sesame oil. Refrigerate until ready to plate.
1 large English cucumber, pinch kosher salt, 1 tbsp (15 ml) rice vinegar, 1 tsp (7 g) honey, 1 tsp (5 ml) toasted sesame oil
Pat the ahi tuna steak completely dry with paper towels. Season lightly on all sides with kosher salt.
1 large (12-14 oz / 340-400 g) ahi tuna steak, kosher salt
Heat a cast iron skillet over high heat for 3 to 5 minutes, until very hot. Add the avocado or canola oil and swirl to coat the surface. Place the tuna in the skillet and sear without moving for 45 to 60 seconds per side for a rare center, or up to 75 seconds per side for a slightly thicker cut. Briefly sear the edges for about 10 seconds each to create a clean finish without increasing doneness.
2 tsps (10 ml) avocado oil
Transfer to a cutting board and rest for 2 minutes. Slice against the grain into 1/4- to 1/2-inch (6–12 mm) slices, wiping the knife between cuts for clean edges.
To plate, swipe a generous layer of the wasabi–Greek yogurt onto each plate. Arrange thinly sliced watermelon radish over the yogurt, then place the tuna slices slightly overlapping so the rare pink interior is visible. Add a small mound of the cucumber ribbon salad alongside. Finish with a light drizzle of the ginger–soy sauce and a scattering of black and white sesame seeds. Serve immediately.
black sesame seeds, white sesame seed, watermelon radish

Notes

Use sushi-grade ahi tuna that has been previously frozen to reduce parasite risk.
Tuna should remain cold before searing to help preserve the rare center.
Patting the fish completely dry is critical for proper browning.
Searing happens quickly; do not multitask during this step.
Pull the tuna slightly before it looks done. Carryover heat continues briefly after removal.
Always slice against the grain for the most tender texture.
This dish is designed to be served rare. Overcooking will result in a firm, chalky texture.
Plate and serve immediately for best contrast and texture.
Sodium is primarily from soy sauce.
Protein is driven almost entirely by the 7 oz tuna per serving.
Carbohydrates come mostly from honey and yogurt.
Fat includes sesame oil and avocado/canola oil (full 2 teaspoons included in calculation).
Fiber comes from cucumber and watermelon radish.
This is a high-protein, moderate-fat, low-carb dish with strong omega-3 contribution from the tuna.

If you’re making this Seared Ahi Tuna, check out the full post. That’s where I keep extra tips, FAQs, and details that don’t always make it into the recipe card

Nutrition info is an estimate and will vary depending on the brands you use.

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