For each drink:
For the batter:
Beat together the brown sugar, butter, spices and vanilla extract until well combined. Refrigerate in an airtight resealable container until ready to use.
For Each drink:
Combine 2 heaping tablespoons of the batter and the rum in a warmed coffee mug. Add boiling water to fill to the top, and mix well. Serve with a spoon.
*Note:
This must be served steaming hot, not lukewarm. It is best to make the batter in advance so the spices have an opportunity to mingle. Be sure to remove the batter from the refrigerator at least 6 hours before serving to allow it to soften. The recipe for the batter makes enough for 10 to 12 servings; refrigerate in an airtight container for up to 1 month, or freeze for up to 2 months.
