In A Saucepan, Melt Butter; Add Sugar And Egg, Whisking To Blend Well. Cook Over Low Heat, Stirring Constantly, Until Mixture Thickens. (Do Not Allow To Simmer, Or It May Curdle.) Whisk In Bourbon To Taste. Remove From Heat. Whisk Before Serving. The Sauce Should Be Soft, Creamy, And Smooth. Bread Pudding: 1 Preheat Oven To 350