Before adding the Guinness to the cocktail shaker, pour some of it into a glass and stir with a bar spoon for about 30 seconds. This releases some of the beer's volatile CO2, which could cause a mess if the shaker is not sealed well. Glassware Guide More Terrific Cocktails
How to Make It
Step
Fill a cocktail shaker with ice. Add all of the remaining ingredients except the garnish and shake well. Strain into a chilled rocks glass and garnish with the cinnamon sugar.
