In a small bowl, mash the sugar, butter, vanilla, cinnamon, cloves, nutmeg, and allspice with a fork until well combined. The spiced butter can be made ahead and refrigerated for up to 3 weeks. Bring the butter to room temperature before using.
Bring a kettle of water to a boil; you’ll need 1/2 cup of water for each drink. Fill mugs or heatproof glasses with hot tap water to warm them. Once the water in the kettle boils, empty the warm mugs and fill each with 1/2 cup boiling water and 1/4 cup rum. Stir a generous tablespoon of the spiced butter into each mug until melted. Garnish with a small dollop of whipped cream.
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