Sift icing sugar in a bowl.
Add Anchor Butter or Grace Hello Margarine and mix together with icing sugar.
Mix in the rum.
Place mixture into a piping bag with a rose tip.
Pipe rosettes on waxed paper and chill in a refrigerator.
To Serve: Serve with Christmas Pudding, or your favourite dessert and decorate with red maraschino cherries and mint leaves.