Gingerbread Manhattan cocktail

Ingredients

For the cocktail (makes 1)

• 35ml bourbon
• 15ml red vermouth
• 15ml white vermouth
• 15ml gin
• 25ml spice syrup (see below)
• A few splashes of Angostura Orange Bitters or Angostura Bitters

For the spice syrup (makes 225ml, enough for 9 cocktails)

• 200ml water
• 100g dark muscovado sugar
• 100g golden caster sugar
• 1 orange, quartered, plus 1 extra, peeled for garnish
• 1 cinnamon stick
• 5 cloves, lightly crushed
• ¼ whole fresh nutmeg, broken with a hammer or rolling pin
• 20g fresh ginger, sliced