In a small bowl, combine all ingredients above until the batter has no lumps; set aside.
Wrap each piece of ‘ahi tuna with two sheets of fresh nori.
Dip them into the tempura batter.
Coat with panko breadcrumbs.
In wok or deep fryer/cast iron pan, preheat oil to 375°F.
Fry fish until golden brown (about 30 to 45 seconds).
Slice into 8 to 10 ¼-inch-thick pieces.