1Add enough water to reserved mandarin orange juice to measure 1 1/4 cups. In 1-quart saucepan, heat juice mixture to boiling.
2Place gelatin in medium bowl. Pour boiling mixture on gelatin; stir until gelatin is dissolved. Stir in cranberry sauce until sauce is melted. Stir in orange segments. Pour into 4-cup mold.
3Refrigerate about 4 hours or until firm; unmold. Serve on salad greens.