MAKE AHEAD TIP: Make the Rocky Road and refrigerate to set. Don’t add the icing sugar yet, but cut into bars, then store in an airtight container in a cool place for up to 1 week. Decorate with icing sugar and edible glitter about 1–2 hours before serving.
FREEZE AHEAD TIP: Make the Rocky Road as above and freeze for up to 1 month. Thaw overnight in a cool place. Decorate as above.
Thank you Nigella Lawson for a great recipe.