Created by Cheesehead on November 24, 2011
Step 1: Prepare Jello according to package directions, adding in the reserved mandarin orange juice for part of the water.
Step 2: Put in fridge to chill until partially set, about 1 1/2 to 2 hours.
Step 3: Fold in the oranges and the Cool Whip and return to fridge to set completely, another 1-2 hours, or so.