Put icing sugar, cocoa powder in a bowl, no sifting required, unless very lumpy.

Pour juice, either stir to mix in the basin, or over very gently heat.

When fully dissolved add colour and flavour, mix till even.

Pour all at once over cake.

Quickly spread evenly, allowing to flow over sides.

Run with a knife dipped in hot water to even top.

When fully cooled, slash off side overruns if so desired.

Allow to cool completely before touching it for further decorations.