German Chocolate Frosting

This is for all who love German Chocolate cake. I'm not a big fan of it myself, but my husband loves it. This is my mom's recipe. I've been told it is good.

1 cup evaporated milk
3 eggs yolks slightly beaten
1 teaspoon vanilla
1 cup sugar
1/2 cup butter
1 cup chopped nuts
1 1/2 cup coconut

1. In a sauce pan, combine the milk sugar, butter, egg yolks, and vanilla.
2. Cook over medium heat and stir constantly while mixture thickens.
3. Remove from heat and stir in the nuts and coconut.
4. Spread on cooled chocolate cake.