German Chocolate Cake

Name: German Chocolate Cake
Prep time: 2 h
Cook time: 45 min
Total time: 2 h 45 min
Cuisine: American
Ingredients: 1 cup evaporated milk; 3 large egg yolks (reserve whites for buttercream); 1 tsp vanilla extract; 1/2 cup granulated sugar; 1/2 cup light brown sugar (packed); pinch salt; 1/2 cup unsalted butter (cubed); 3/4 cup flaked coconut (toasted (sweetened or unsweetened)); 3/4 cup shredded coconut (toasted (sweetened or unsweetened)); 1 cup chopped pecans (toasted); 2 cups all-purpose flour; 2 cups granulated sugar; 3/4 cup Dutch-processed cocoa powder (sifted); 2 tsp baking soda; 1 tsp baking powder; 3/4 tsp salt; 1/2 cup vegetable oil; 1 cup buttermilk (room temperature); 1 cup hot water (or hot coffee); 2 large eggs (room temperature); 2 tsp vanilla extract; 5 large egg whites; 1 2/3 cups dark brown sugar (packed); 2 cups unsalted butter (room temperature); 8 oz good quality dark chocolate (chopped, melted, cooled); 1/4 cup Dutch-processed cocoa powder (sifted)