Pudding sauce is a smooth, sweet sauce made from milk, sugar, and cornstarch. It is often used as a topping for desserts, such as pudding, cake, or pie.
Combine the sugar and flour and mix well.
Add the boiling water stirringconstantly to prevent lumping.
Cook in double boiler until the mixturethickens.
Add butter and stir until melted.
Flavor and serve.