Hot Buttered Rum  | Ingredients:  3/4 cup lightly packed dark brown sugar   1/2 cup (8 Tbs.) unsalted butter, at room temperature   1 tsp. pure vanilla extract   1/2 tsp. ground cinnamon   1/4 tsp. ground cloves   1/4 tsp. freshly grated nutmeg   1/4 tsp. ground allspice   2-1/2 to 3 cups high-quality dark rum, preferably Gosling's   Whipped heavy cream for garnish
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