• 325g (11oz) plain flour, sifted, plus extra for dusting
• 200g cold salted butter, cut into cubes
• 125g golden caster sugar
• 1 vanilla pod, seeds scraped out
• 2 large free-range egg yolks
• few plastic toy dinosaurs with different-sized feet
• red, yellow, green and orange flavoured writing icing pens
• 1 free-range egg, beaten