Ingredients

  • CAKE
  • 1 1/2 cups unsalted butter
  • 1 1/2 cups water
  • 1/2 cup unsweetened cocoa
  • 3 cups sugar
  • 3 cups flour
  • 1 tablespoon salt
  • 1 tablespoon baking soda
  • 3 large eggs
  • 3/4 cup buttermilk
  • 1 tablespoon vanilla
  • ICING
  • 3/4 cup unsalted butter
  • 4 1/2 ounces buttermilk
  • 7 1/2 tablespoons cocoa
  • 1 1/2 cups powdered sugar, sifted

Method

  • Preheat oven to 350 degrees.
  • Butter and line with parchment a 9 x 13 cake pan Melt butter, stir in water and cocoa and whisk until smooth.
  • set aside.
  • sift together flour, sugar, salt and baking soda.
  • In a separate bowl, whick together eggs, buttermilk and vanilla.
  • Add cocoa mixture and buttermilk mixture to dry ingredients.
  • Combine very well.
  • Pour into cake pan and bake until skewer comes out clean.
  • Cool for 20 minutes while making icing.
  • ICING: Melt butter, add buttermilk and cocoa.
  • Whisk until smooth.
  • Put powdered sugar into a food processor.
  • With motor running, pour cocoa mixture through feed tube.
  • Do not over process.
  • Put a platter over the cake pan, flip over so that the cake comes out onto the platter.
  • Remove parchment Pour icing over the top of cake and spread evenly over cake to the edges using an offset spatula.
  • Do not worry if some goes over the sides.
  • Refrigerate cake for 2 hours.
  • Remove from refrigerator and with a serrated knife, trim all 4 sides of the cake about 1/4 inch.
  • Cut into pieces to serve.