Step 1In the bowl of a stand mixer, or in a large bowl, combine the heavy cream with the powdered sugar, nutmeg, cinnamon and vanilla. Using a mixer, whip the cream to medium peaks. With the mixer running on low speed, add one-fourth cup of the reserved pineapple juice. Taste and adjust the seasonings or pineapple juice to taste. Set the whipped cream aside.
Step 2In a separate large bowl, combine the diced pineapple, marshmallows, maraschino cherries, coconut, walnuts, orange and apple. Fold in the whipped cream to coat completely.
Step 3Serve the ambrosia topped with a dusting of ground nutmeg and cinnamon.