录 tsp ground coriander
300驳/10陆辞锄 plain flour, plus more for rolling
录 tsp ground allspice
陆 tsp bicarbonate of soda
100驳/3陆辞锄 soft light brown sugar
录 tsp ground cardamom
2 tbsp ground cinnamon
录 tsp ground cloves
1 tsp ground ginger
225g/8oz instant royal icing powder
录 tsp ground nutmeg
录 tsp fine sea salt
1 tbsp speculaas spice (see above)
100驳/3陆辞锄 black treacle (plus a little oil for greasing a jug for weighing the treacle in)
100驳/3陆辞锄 butter, softened
1 large egg, at room temperature