This is an old-school fluffy frosting that's also often called "boiled milk frosting." Its nickname clues you in as to how it ...

A whole orange is boiled and puréed to make a rich marmalade ... Transfer to a bowl and set aside, reserving two tablespoons for the icing. Add the remaining cake ingredients to the food ...

Meanwhile place the boiled sweets in a pestle and mortar and ... Leave to cool completely on the baking trays. For the icing, whisk the egg whites in a large bowl until frothy.