Add all ingredients except the cider into a shaker with ice and shake.
Strain into a double Old Fashioned glass over fresh ice.
Top with the cider.
Garnish with an apple slice and a sprinkle of grated nutmeg.
*Vanilla-nutmeg syrup: Combine 2 cups sugar, 2 tsp ground nutmeg, 6 vanilla beans (cut in half lengthwise) and 2 cups water in a small saucepan and cook over low heat, stirring until sugar is fully dissolved. Let syrup cool completely and strain into a closed container. Store in refrigerator.