Divine German Chocolate Cake by Dinners Being Delivered

1 Box of devils food cake mix
Prepare according to package directions, dividing evenly to make 3 layers.  Let cool, and set aside.
Coconut Pecan Filling
1 cup whipping cream
1 cup sugar
3 egg yolks
1/2 cup butter
1 tsp. vanilla extract
1 1/2 cups of flaked coconut
1 cup chopped pecans

Cook the first 4 ingredients in a medium saucepan over medium heat, stirring constantly, 7 minutes or until thickened.  Remove from heat; stir vanilla, coconut and pecans.  Allow to cool for about 30 minutes before frosting cake.