Place shoyu, brown and white sugars, ginger, sherry, oil, green onions, garlic, white pepper and 3/4 gallon water in a large pot and bring to a rolling boil. Let cool, then strain out the solids so you are left with just teriyaki sauce. Place the ahi in a large bowl and cover with the teriyaki marinade (save remaining marinade for another use). Let marinade, refrigerated, 4 to 6 hours.
Preheat a grill for cooking at medium-high heat. Oil tuna and sprinkle with salt and pepper, then grill to desired doneness, 2 1/2 minutes per side for medium-rare.
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This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.
Recipe courtesy of The Dolphin, Kauai, HI
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