1. In a saucepan, combine the brown sugar, the butter, 1 teaspoon of the cinnamon, the nutmeg, the cloves, and 2 cups water, and bring the mixture to a boil, whisking constantly. Simmer the mixture for 5 minutes and stir in the rum. Divide the mixture among 4 heated mugs, and sprinkle each drink with some of the additional cinnamon.