Decorating a German chocolate cake is simple. Frost the outside of the cake, being sure that it is fully cooled off before beginning. Add a layer of coconut pecan frosting on the top of the cake, spreading almost to the edge of the cake. Next, use a large star or a closed-star tip on a piping bag or gallon-sized Ziploc bag to pipe top chocolate border. You may optionally chill the cakes before frosting, this can help make the process much easier for you.