- Line bottoms of 3 9” cake pans with wax paper, grease sides. 
- Microwave chocolate and water 1 ½ - 2 minutes until chocolate is almost melted, stirring after each minute. 
- Stir until chocolate is completely melted. 
- Mix flour, baking soda and salt, set aside. 
- Beat butter and sugar in large bowl until light and fluffy. 
- Add egg yolks one at a time, beating well after each addition. 
- Stir in chocolate mixture and vanilla. 
- Add flour mixture alternately with buttermilk, beating until well blended after each addition. 
- Beat egg whites in another large bowl with electric mixer on high speed until stiff peaks form. 
- Gently stir into butter, pour evenly into prepared pans. 
- Bake at 350°for 30 minutes, immediately run spatula between cakes and sides of pans. 
- Cool 15 minutes, remove cake layers from pans. Remove wax paper. Cool completely on wire racks. 
- Spread coconut-pecan filling and frosting between layers and on top of cake.