4 ounces (1 stick) unsalted butter, room temperature. 8 ounces brown sugar or demerara sugar (sugar in the raw) 1/4 teaspoon ground cloves. 1/4 teaspoon fresh-grated nutmeg.
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for each drink:
- 2 tablespoons batter, to taste.
- 2 ounces dark rum.
- 4 ounces boiling water.
- ground nutmeg, for garnish.