The driskill's 1886 room chocolate sheet cake (visit site!)

Ingredients

• For the Cake
• 1 cup unsalted butter
• 2/3 cup water
• 1/2 heaping cup cocoa (unsweetened)
• 2 cups all-purpose flour, sifted
• 2 cups sugar
• 1 teaspoon salt
• 2 eggs, beaten lightly
• 1 cup buttermilk
• 2 teaspoons vanilla extract
• 1 heaping teaspoon baking soda
• For the Icing
• 1/2 cup unsalted butter
• 3 heaping tablespoons cocoa (unsweetened)
• 4 tablespoons half-and-half
• 2 cups powdered sugar
• 1 cup chopped pecans, toasted
• 1 teaspoon vanilla extract

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Preparation

• For the Cake
  Preheat the oven to 350 degrees. Grease and flour a 9"x13" cake pan.
  
  Melt the butter in a large, heavy saucepan over medium heat. Remove the pan from the heat and add the water and cocoa, stirring well.
  
  Sift together the flour, sugar, and salt, and stir them into the chocolate mixture.
  
  In a large bowl, combine the eggs, buttermilk, vanilla, and baking soda, add the chocolate mixture, and mix well.
• Spoon the cake batter (or gently pour) into the prepared pan, and bake 30 minutes, or until a toothpick inserted in the center comes out clean.
• For the Icing
  While the cake is baking, melt the butter with the cocoa in a heavy saucepan over medium heat. Add the half-and-half, and heat it through. Mix in the remaining ingredients, blend well, and remove the pan from the heat.
• Finishing the Cake
  While the cake and icing are still warm, gently pour the icing over the cake. Serve the cake warm or at room temperature.