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In a small bowl, beat butter together with brown sugar, powdered sugar, nutmeg, and cinnamon.
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Beat in the softened ice cream.
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Pour the ice cream mixture into a freezer-proof container, seal, and freeze.
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When ready to serve, put about 1/3 cup of the ice cream mixture into individual mugs.
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Add 1 jigger of rum and 1/2 cup boiling water to each.
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Stir well and serve. Add whipped cream if you like.
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Variation: Place 2 jiggers of dark rum, a twist of lemon peel, and a cinnamon stick in an ale mug. Fill with boiling hard cider, add a pat of butter, and stir with a cinnamon stick.