In a large bowl, combine cranberry sauce and crushed pineapple. If you find that there's still too much pineapple juice in the bowl, tip the bowl and carefully drain it before you move on.
1-20 ounce can crushed pineapple, 1-14 ounce can whole berry cranberry sauce
Add Cool Whip and use a spatula to stir until well combined.
8 ounces Cool Whip
Add mini marshmallows and stir again until well combined. Also add orange zest at this time (if you've chosen to include it).
2 cups mini marshmallows, 1/4 cup orange zest
Cover and chill for at least a couple hours (but no more than 24 hours before serving). Top with fresh cranberries and mini marshmallows and serve. Enjoy!
Fresh cranberries for garnish
Notes
If you prefer it less creamy, add an additional cup of mini marshmallows and/or another half a jar of whole cranberry sauce, or you can omit 2 ounces Cool Whip.