1. Drain orange segments, reserving 2 tablespoons liquid for dressing. Place orange segments in shallow glass or plastic dish. In tightly covered container, shake orange liquid, vinegar, honey, oil and cinnamon until well blended. Pour over oranges. Cover and refrigerate at least 15 minutes.
2. In large bowl, toss lettuce, mushrooms, bean sprouts and onion. Spoon oranges and dressing onto salad; toss lightly. Sprinkle with sesame seed.