Add all ingredients into a shaker with ice and shake well.
Strain into a rocks glass over fresh ice.
Garnish with grated nutmeg.
*Cinnamon simple syrup: Add 4 cinnamon sticks, 1 cup sugar and 1 cup water into saucepan. Bring to boil, reduce heat and simmer until sugar dissolves. Remove pan from heat and let steep for 20 minutes. Remove cinnamon sticks and store syrup in refrigerator up to 2 weeks. (Optional: Mix 1/2 oz simple syrup with 1 dash ground cinnamon.).