1Day 1: Place fish skin side down on platter. Rub flesh with 1-1/2 teaspoons salt; cover lightly with waxed paper, plastic wrap or foil; refrigerate 24 hours. Day 2: Drain off any liquid. Wipe fish dry with paper towels. Rub flesh with 2 tablespoons oil. Refrigerate 24 hours. Repeat alternate processes for Days 3,4, 5 and 6. On Day 6, also rub brown sugar onto fish. Day 7: Hang fish in cool, dry, airy place 24 hours. To serve, cut in paper-thin slices against grain. Makes 12 appetizer servings.