Prepare a martini glass: Fill with ice, top with water, and set aside to chill. Combine all ingredients in a cocktail shaker with ice and shake hard to combine. Discard ice and water from chilled martini glass; strain cocktail into glass. Garnish with a lemon twist, piece of candied ginger, or a maraschino cherry if desired, and serve.
* To make simple syrup: Combine equal parts water and white sugar, and simmer or microwave until sugar is dissolved, stirring periodically. Allow to cool before using, and store in the refrigerator.
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