Slice each fillet in half. Season both sides liberally with salt, then place each fillet on a wire rack set over a drip pan. Refrigerate, uncovered, for 24 hours, then flip over and refrigerate for another 24 hours.
Preheat an outdoor grill or turn an oven broiler to high.
If using a grill, place the fillets on the grate over high heat for 2 to 3 minutes per side. If using a broiler, place the fillets on a wire rack over a drip pan directly under the broiler for 2 to 3 minutes per side. Serve immediately with the grated daikon and a drizzle of soy sauce to taste.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.