Wet the nori sheets on one side with water and place them, dampened side up, on a flat work surface. Place a strip of salmon at one end of each sheet and roll it tightly, enclosing the salmon. Cut each roll in half and then cut each half into thirds. You should have 6 slices per roll, or 18 slices in all. Arrange the nori-wrapped salmon pieces on a plate and place in a steamer over boiling water. Cover and steam for about 5 minutes, until the salmon is barely cooked, even slightly rare in the center. Meanwhile, combine all the sauce ingredients in a small bowl. Remove the salmon from the steamer and arrange it on a serving plate. Spoon some sauce over the salmon and sprinkle some salmon skin crackling on top and serve. Nutrional analysis per serving: calories 227; protein 23 gm; carbohydrates 1 gm; fat 14.0 gm; saturated fat 1.6 gm; cholestorl 62 mg; sodium 243 mg.