Rich, chocolatey and best reserved for special occasions!
This will easily cover a cake up to 30cm / 12inches, and is delicious on fairy cakes / cupcakes etc. too. You can also use to sandwich a cake together - it should do two layers if you don't spread it too thickly. The cake won't need to be refrigerated, although you can do if you wish, and the icing will become firm if you do.
It's very quick to whip up and easy to spread or pipe. Here it's been spread rather generously on a chocolate 'Magic Bean Cake' (recipe here).
