MISSISSIPPI GERMAN CHOCOLATE CAKE

3 cups all poupose flour 1 cup butter unsalted 4 eggs 2 cups sugar 1 4oz baking German chocolate bar 1/2 cup hot water 1 1/2 baking powder 1 1/2 baking soda 1 cup buttermilk 1 teaspoon vanilla extract Bake on 350 for 35 to 45 minutes GERMAN CHOCOLATE ICING 1 cup sugar 1 cup evaporated milk 1/2 cup butter 3 eggs yolk 1 1/2 cup coconut 1 cup chopped pecans 1 teaspoon vanilla extract