Garth Brooks German Chocolate Cake With Coconut Frosting

Name: Garth Brook's German Chocolate Cake With Coconut Frosting
Ingredients: 4 ounces sweet dark chocolate; 1 cup butter, room temperature (2 sticks); 1⁄4 cup warm milk; 2 1⁄2 cups sifted cake flour; 1 teaspoon baking soda; 1⁄2 teaspoon salt; 5 medium egg whites; 2 cups sugar; 5 medium egg yolks, at room temperature; 1 teaspoon vanilla extract; 3⁄4 cup buttermilk, well shaken; Coconut Frosting; 1 cup sugar; 4 medium egg yolks; 1 cup evaporated milk; 1⁄2 cup butter (1 stick); 10 ounces fresh grated coconut (or frozen); 1 1⁄2 cups pecans, finely ground (or walnuts or almonds)