Combine the first 4 ingredients in a small bowl; set aside. Snap off tough ends of asparagus. Place asparagus and water in an 11 x 7-inch baking dish. Microwave at high for 3 minutes or until tender; drain. Pour the vinegar mixture over the asparagus, and toss well. Chill at least 1 hour or overnight. Serve cold or at room temperature. Sprinkle asparagus with sesame seeds, if desired.