Shake all ingredients with ice and strain into a martini glass. Garnish with a skewer of raisins and/or sprinkle on top. For multiple drinks just scale up ingredients!
Raisin simple syrup: blend 1 cup of raisins with one cup of water. Place in a pot with 1 cup of sugar. Boil mixture, stirring until sugar dissolves. Strain through a coffee filter and let cool. Will keep indefinably in refrigerator.