Preheat oven to 180°C (160°C fan) mark 4 and line 2 large baking sheets with baking parchment. Lightly flour a work surface and roll out dough to 3mm thick. Stamp out spooky shapes, rerolling ...

Royal icing is unlike most other icings. It can dry out quickly if you let it, ruining your chance to use it. Don't let that happen with Julia Child's tip.