Step 1

Combine orange jell-o, vanilla pudding and hot water in a large saucepan.

Step 2

Bring to a boil, stirring frequently.

Step 3

Continue boiling (and stirring) until mixture turns a clear orange color (about 5 minutes).

Step 4

Pour into a large bowl and chill overnight. Alternatively, chill until set (about 4 hours).

Step 5

Combine Cool Whip with jell-o/pudding mixture (a potato masher works well for this step).

Step 6

Add mandarin oranges and stir gently.

Step 7

Refrigerate until ready to serve.