Rinse each of the fish steaks under fresh cold water, then pat them dry. Let the fish marinate in the rice wine for 5 to 10 minutes, turning the fish once halfway through.
Preheat your broiler to the highest setting possible, or if you are grilling outdoors, make sure your coals are burning hot.
Remove the fish from the marinade, and very lightly salt the flesh on both sides. Salt the surrounding skin a bit more generously. Place the fish on a rack set over a foil-lined tray, or use disposable foil broiling pans for easier cleanup. If you are broiling outdoors, you may wish to lightly oil the rack on which the fish will be laid. Broil the fish for 6 to 7 minutes, or until it is opaque and slightly browned around the edges. Flip the fish with a large metal spatula, and broil for 2 to 3 more minutes, until the fish is just cooked through.
Cut the lemon into 4 wedges, and serve each piece of fish with one of them. The Japanese typically serve a small mound of grated radish to the side of the fish. Each person then dribbles some soy sauce over the radish and spread this mixture on the fish just before conveying it to the mouth. If you wish to follow suit, drain the grated radish of excess liquid before mounding it on the plates.