Warm the sake in a small sucepan. Ignite with a match, off the heat, and shake tha pan gently until the flame dies out. Pour the sake into a dish and cool. Put the sake with the grated daikon, onions, soy sauce, lemon juice, MSG, and the 7 pepper spice into a mixing bowl. Mix well. To serve, place in small individual dishes and serve with sea bass, sea bream, or sashimi.