Marinate fish in ponzu 20 minutes; drain and pat dry. Mix tempura batter mix with 12 cups ice water.
For each serving, to order, dredge 3 pieces fish in dry tempura batter mix, patting off excess. Dip fish in prepared tempura batter to coat completely; deep-fry in hot (350°F) oil until golden brown. Deep-fry 4 ounces steak fries in hot oil until golden brown. Arrange fish and fries in newspaper or parchment paper cone; sprinkle with sesame seed and nori strips. Serve with tartar sauce and ponzu sauce on the side.
To make Tartar Sauce, mix together 4 cups mayonnaise; 1/2 cup each roughly chopped capers, roughly chopped cornichons and diced red onion; 1/4 cup chopped cilantro and 3 tablespoons Kikkoman Lime Ponzu. (Yield: 6 cups)