Preheat the oven to 350 degrees. Cut a piece of parchment paper to fit inside a 16-inch round
cake pan and place inside.
Grease the bottom and sides of the pan with butter.
Dust with flour and tap out any excess. Set aside.
Sift the flour, baking soda and salt into a bowl. Set aside. Combine the cocoa and the warm water in a medium sized bowl, whisk until smooth. In another medium sized bowl
whisk the buttermilk, water and vanilla, set aside. Add the softened butter to the bowl of a standard
mixer. Add the
white sugar and the light brown sugar, beat with the paddle until very light in color and texture, about 3 minutes. Scrape the sides of the bowl with a spatula. Break 4
eggs into a small bowl. On low speed, add 1 egg at a time to the bowl. Add the additional eggs only after each is well combined. Scrape the bowl with a
spatula. Raise the speed to medium, beat 1-minute until light and fluffy. Add the cocoa mixture, beat on low speed until just combined. Add the flour mixture and the buttermilk mixture alternately: 3 additions of flour, 2 of the
buttermilk. I do this visually, a little more than 1 cup of flour, then about 1 cup of the buttermilk mixture, then repeating. Remember to scrape the sides of the bowl with a spatula after each addition. The batter will be smooth. Gently fold in the grated chocolate. Pour the
batter into the prepared pan. Bake in the center of the oven until done, about 45 minutes. Do not over bake, the cake will fall firm in the center. Cool. Turn the cake over onto your work surface.
Peel off the parchment paper. Cut the cake in half horizontally with a serrated knife. Fill the cake with Chocolate Cream Filling. Top the cake with Thick and Rich
Chocolate Glaze.
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