Chocolate orange cocktail

First make an orange syrup. Combine 100ml water with the golden caster sugar and the orange or clementine zest in a pan and bring to the boil. Cool and strain the syrup.

Chill 4 coupé glasses, then dampen the rims with a little water and dip in the grated dark chocolate. In a cocktail shaker, shake the vodka, crème de cacao, orange syrup and orange juice with ice (you may need to make in 2 batches). Pour into the glasses.