SIMPLE SYRUP: Mix the sugar and water in the sauce pan and bring to a boil. The sugar should dissolve completely. Let cool completely and transfer to a jar or squeeze bottle. Makes about 12 ounces, and will keep for up to 1 month in the refrigerator.
COCKTAIL: Fill the cocktail shaker with ice, then add the remaining ingredients. Shake well, then strain into the chilled martini glass.