Roy Yamaguchi’s Blackened Island Ahi recipe served on a plate, by Pekin the Chef
Aug 04 2026
Restaurants›Roy's Waikiki›Roy Yamaguchi’s Blackened Island Ahi Recipe

Roy Yamaguchi’s Blackened Island Ahi Recipe

Inspired by Roy's Waikiki
Time1h
Serves4

Spicy Soy Mustard, Butter Sauce, Nori Puree, Cucumber Namasu

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Ingredients

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Fish

Spicy Soy Mustard Butter Sauce

Nori Puree

Cucumber Namasu

Method

Preparation

  1. 1

    Prepare Cucumber Namasu

    Slice cucumber thinly and combine with rice vinegar, sugar, and salt in a bowl. Mix well and let sit for at least 30 minutes.

  2. 2

    Make Nori Puree

    Soak nori sheets in water for about 10 minutes. Blend until smooth and set aside.

Cooking Ahi

  1. 3

    Blacken Ahi

    Rub the Ahi tuna steaks with olive oil and coat generously with blackening spice mix. Heat a skillet over high heat. Sear the steaks for 2-3 minutes per side until blackened and cooked to desired doneness.

Sauce Preparation

  1. 4

    Prepare Butter Sauce

    In a small saucepan, melt the butter over medium heat. Stir in soy sauce, Dijon mustard, and Sriracha sauce. Cook for another 2-3 minutes until slightly thickened.

Plating

  1. 5

    Serve

    On each plate, drizzle some nori puree, place the blackened Ahi steaks, and spoon the spicy soy mustard butter sauce over the top. Add a side of cucumber namasu.

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