Hot Buttered Rum Drink Recipe Ingredients 1 ounce dark rum 1/2 cup boiling water 1 heaping tablespoon hot buttered rum mixture (recipe follows) ~ cinnamon ~ nutmeg Hot Buttered Rum Mixture 2 cups brown sugar 2 sticks butter, room temperature 2 cups good-quality vanilla ice cream, melted 1 teaspoon ground cinnamon 1 teaspoon ground nutmeg (yes—this much!)