Making the compound butter in advance will improve the finished drink. You could also package it for a seasonal gift.
2 tsp compound butter*
6 oz. boiling water
1-2 oz. dark rum to taste
Combine compound butter and boiling water in your serving mug and stir to dissolve. Add rum and garnish with a cinnamon stick.
*Compound butter: Cream together 1/4 lb unsalted butter, 2 cups brown sugar, 1 tsp ground cinnamon, 1/2 tsp each of ground ginger, grated nutmeg, ground allspice and salt. Divide mixture into small sterilized mason jars with lids and refrigerate. Makes approximately 24 servings.
—by Justin Taylor