Step 1: The No-Bowl Method
In a large mixing bowl, empty the entire package of instant pistachio pudding mix. The key here is to use a bowl large enough to eventually hold all the ingredients with room for folding.

Step 2: Hydrate the Pudding
Open the can of crushed pineapple and pour it directly into the bowl with the dry pudding mix. DO NOT DRAIN THE PINEAPPLE. The juice from the can is the liquid that will “set” the pudding. Immediately, begin stirring with a spatula or whisk. The mixture will be thick and will quickly begin to thicken further as the pudding mix hydrates.

Step 3: Incorporate the “Fluff”
Add the entire container of thawed Cool Whip to the bowl. Using a spatula, begin to gently fold the Cool Whip into the pineapple-pudding mixture. “Folding” is a gentle, lifting motion that preserves the airy texture of the Cool Whip. Continue until the mixture is a uniform, pale green color with no visible white streaks.

Step 4: Add the Mix-Ins
Now, add your miniature marshmallows, the well-drained and quartered maraschino cherries, and any optional ingredients like drained mandarin oranges and chopped nuts. Gently fold these into the fluffy base until they are evenly distributed throughout.

Step 5: The Chill and Set
Transfer the fluffy mixture to a serving bowl. Cover the bowl tightly with plastic wrap. This is a crucial step for the perfect texture and flavor. Refrigerate the salad for at least 4 hours, but ideally overnight.

Step 6: Garnish and Serve
Just before serving, give the fluff salad one final gentle stir. Garnish the top with a few whole or halved maraschino cherries and a sprinkle of additional chopped nuts for a beautiful presentation.

Step 7: Enjoy the Tradition
Serve chilled, using a large spoon to scoop out portions. Enjoy this sweet, creamy, and nostalgic side dish as the perfect complement to your holiday feast.