1
Gently warm 60g golden caster sugar in a pan with 30ml water and 1 tbsp allspice.
2
Cook gently until the sugar has dissolved, then leave the mixture to cool.
3
Strain through a sieve lined with a coffee filter (or a double layer of kitchen paper).
4
Pour 60ml of the spiced syrup into a cocktail shaker along with 200ml rum and 90ml lime juice.
5
Shake with ice and strain between six flute glasses.
6
Top up with 600ml champagne and garnish each with an orange twist.