Combine all ingredients in a cocktail shaker with 1-1 1/2 cups crushed ice. Whip shake until shaker frosts, then open pour into a small snifter (or double old-fashioned glass). Add more ice to fill if necessary. Garnish with a plum (or apricot or peach) wedge, lime wheel, and mint sprig. *Plum Syrup: combine 1 cup water, 1 1/2 cups sugar (recommend 2:1 mix of white and Demerara), and 1 1/2 cups chopped plums to a small saucepan on medium heat. Stir until it comes to a boil. Reduce heat and cover. Let simmer 30-60 minutes. Strain, then bottle once cooled.
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