Melt the chocolate with boiling water; in large mixing bowl mix butter and sugar until light. Beat in eggs yolk, one at a time. Beat in chocolate and vanilla. Mix in flour, baking soda, and salt every other with buttermilk, beating after every addition until batter is sleek. Fold in egg whites.
Step 3:
Divide batter between pans until cooked.
Coconut-Pecan Frosting :
Mix sugar, milk, butter, vanilla, and egg yolks in a saucepan. Cook over heat, until thick, for 13 minutes.