We ate that soup a couple years ago and have been replicating it this way and impressing our friends with it ever since. It's simple yet satisfying!
FIRST: Buy 2 cans of pears. Heavy syrup is fine.
NEXT: Dump one can into a flat bowl, cover and freeze.
THEN: Chill the other can in the fridge.
FINALLY: Roughly chop the frozen clump, put all pears in the blender and puree. Garnish as desired.
THAT'S IT!!! It tastes just like Royal Caribbean's. They may or may not put more in theirs, but this tastes the same. Try it!