1/2 cup granulated sugar
1/4 cup water
1/4 cup light corn syrup
3 tablespoons DARK rum
1/3 cup heavy cream
1/4 teaspoon grated nutmeg
1 tablespoon unsalted butter

Combine sugar, water and syrup in a saucepan and bring to a boil. Reduce heat and simmer until a caramel forms. Remove pan from heat and slowly add remaining ingredients. Stir well to incorporate. Return to heat, and cook until the mixture is completely melted and smooth, about 3 minutes.