500g icing sugar
3 egg whites
1 teaspoon glycerine (to stop it going to hard)
Add the icing sugar spoonful at a time until fully combined. Mix with an electric mix to get rid of any lumps for about 5-10 minutes or until you get stiff peaks. Adding the glycerine for the last minute.
Spread over the cake and smooth the sides with a butter knife. With the back of a spoon, swirl the icing around to look like snow drifts.
Decorate the icing while wet. Leave to dry.