German Chocolate Filling and Topping

Combine the evaporated milk, sugar, egg yolks, and butter in a medium saucepan.

Cook over medium heat, stirring constantly, until the mixture comes to a boil and thickens.

Remove the pan from the heat and stir in the vanilla.

Fold in the flaked coconut and chopped nuts.

Cool the filling, stirring occasionally, until it is thick enough to hold its shape.

Use between and on top of two 9-inch German chocolate cake layers.