In the mix:

¾ oz. dark rum
¾ oz. spiced rum
¾ oz. simple syrup
Hot water
One pat of butter
Serve in an Irish coffee glass, garnish with a sprinkle of allspice.

"It's almost like a meal," said bartender Russ Green of the drink. "It's hearty and goes down easy."

Fun fact: Hot buttered rum used to be a popular drink in Colonial America. Then, the liquor was known as "grog."

Bottom line: Satisfy your sweet tooth with this old-fashioned winter drink.