German Chocolate Cake (Dupree)

INGREDIENTS:

4 oz German sweet chocolate
1/2 c Boiling water
1 c Butter
2 c Sugar
4 Egg yolks
4 Egg whites; stiffly beaten
1 ts Vanilla
2 1/2 c Flour
1 ts Baking soda
1/2 ts Salt
1 c Buttermilk
Coconut pecan filling and