Revolver
Flamed coin-sized orange zest twist
STIR all ingredients with ice and strain into chilled glass.
[['6 cl', 'Bourbon whiskey'], ['1.5 cl', 'Coffee liqueur'], ['2 dash', 'Orange Bitters by Angostura'], ['0.25 cl', 'Sugar syrup (65.0°brix, 2 sugar to 1 water rich syrup) (optional)']]
[['6 cl', 'bourbon whiskey'], ['1.5 cl', 'coffee liqueur'], ['2 dash', 'angostura'], ['0.25 cl', 'sugar syrup']]