Chill a large bowl in the freezer for about 30 minutes.
Pour the heavy cream in the chilled bowl.
Add the cinnamon, nutmeg, vanilla extract, and (if making this for adults) the liquor. Using a whisk, beat until the mixture begins to firm up.
Gradually add the sugar. Continue to beat until you get semi-still peaks. It will take a while and you might build some muscle in the process. This is a labor of love. If you want to go the easy way, you can use an electric mixer.