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1. 
Add the cinnamon, cloves and star anise to a dry frying pan and toast for 5 minutes, or until the spices are fragrant. Remove from the heat and leave to cool.
 
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2. 
Tip all the spices into a jar and pour over the gin. Seal and chill for 48 hours to infuse.
 
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3. Strain the infused gin through a fine mesh sieve. 
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4. Fill the glasses with ice. 
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5. Mix the cocktail by tipping 25ml of the infused gin, vermouth and Campari into the glasses. 
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6. Garnish with orange slices and bay leaves.