Meanwhile, make the salad: Line a platter with greens. At one end, arrange piles of Napa cabbage, carrots and bean sprouts. Place beef in a medium bowl, add cornstarch-soy sauce mixture and toss to coat well. In medium nonstick skillet, heat oil over medium-high heat. Add beef and stir-fry until medium-rare, 2 to 3 minutes. Add green onions and stir-fry just until slightly softened, about one minute. Arrange beef mixture at one end of platter. Drizzle dressing over greens and vegetables and serve. On a salad plate, individuals can put the greens that are drizzled with dressing and some beef on top and enjoy. Serves 4.