In a large bowl, whisk together the egg yolks, lemon juice, vinegar and mustard. Whisk in the oil in a steady stream until emulsified and thick. Season to taste with salt. (Alternately, use a blender or a food processor.) Stir in the tamari, lime juice, wasabi and relish.

Season the fish with salt, pepper and Old Bay. Place the flour in a shallow dish. In another shallow dish, lightly whisk the eggs with a splash of water. In a third shallow dish, combine the panko with the chives, ginger and garlic. Coat the fish in the flour, then dip in the eggs, then coat with the panko.

Heat about 1/4-inch of oil in a large skillet over medium-high heat. Fry the fish until golden, about 3 minutes per side. Transfer to a paper towel lined plate and squeeze fresh lime over the fish.

To serve, cut the buns in half. Spread the Wasabi Tarter Sauce on inside of the top and the bottom of each but. Place the fish on the bottom bun and top with sliced cucumbers, sliced radishes, shredded cabbage and cilantro. Top with the top half of the bun and serve.