Icing sugar as the name suggests is used in icings confections drinks etc. Its fine texture makes icing sugar ideal for dusting over cakes pies and pastries to sweeten as well as to add an attractive decorative touch. It is also used to make icings and fondants for cakes and sweets such as peppermint creams Icing sugar is used in icings confections drinks etc. Its fine texture makes icing sugar ideal for dusting over cakes pies and pastries to sweeten as well as to add an attractive decorative touch. It is also used to make icings and fondants for cakes and sweets such as peppermint creams