Microwave chocolate and water in large microwaveable bowl on high for 1-1/2 to 2 minutes or until chocolate is almost melted. Remove and stir chocolate until completely smooth.
Beat egg whites in small bowl with a mixer on high until stiff peaks form; set aside. Mix flour, baking soda and salt. Beat butter and sugar in large bowl with mixer until light and fluffy. Add egg yolks, 1 at a time, beating well after each. Blend in melted chocolate and vanilla. Add flour mixture alternately with buttermilk, beating until well blended after each addition. Add egg whites; stir gently until well blended.
Prepare 3 round pans with waxed paper on bottoms. Spray sides with cooking spray. Then pour batter into pans.
Bake for 30 minutes at 350. Take a toothpick and insert it in each center of the cakes; it should come out clean then cake is done. Immediately run small spatula around cakes in pans; cool cakes for 15 minutes; remove from pans to wire racks. Then cool completely.
Spread Coconut-Pecan Filling and Frosting between cake layers and onto top of cake. Recipe is below.
Recipe by JAQUO Lifestyle Magazine at https://jaquo.com/german-chocolate-cake/