Coca-Cola Cake
  submitted by Bonkerz
Ingredients 
  2 1/2 cups white sugar 
  2 cups all-purpose flour 
  1/2 cup shortening 
  1/2 cup butter 
  3 tablespoons unsweetened cocoa powder 
  1 cup cola-flavored carbonated beverage 
  1/2 teaspoon baking soda 
  1/2 cup buttermilk 
  2 eggs, beaten 
  1 teaspoon vanilla extract 
  1 cup sour cream 
  1/2 cup butter 
  6 tablespoons cola-flavored carbonated beverage 
  3 tablespoons unsweetened cocoa powder 
  4 cups confectioners' sugar 
  1 cup chopped walnuts 
Directions 
  1 Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9x13 inch 
  pan. In a medium saucepan, combine 1/2 cup shortening, 1/2 cup butter, 3 tablespoons 
  cocoa and 1 cup cola. Bring to a rapid boil and remove from heat. 
  2 In a large bowl, mix together the sugar and flour. Pour in the cola mixture 
  and blend with a mixer. In a medium bowl, dissolve the baking soda in the buttermilk 
  and add eggs, vanilla and sour cream. Mix well and then stir into the batter. 
  Beat for 2 to 3 minutes. 
  3 Pour batter into prepared 9x13 inch pan. Bake in the preheated oven for 30 
  to 40 minutes, or until a toothpick inserted into the center of the cake comes 
  out clean. 
  4 To make the Frosting: In a medium saucepan, combine 1/2 butter, 6 tablespoons 
  cola, and 3 tablespoons cocoa. Bring to a boil, stirring constantly. When smooth, 
  remove from heat and add confectioners' sugar and nuts. Beat until smooth, then 
  pour over cake while both frosting and cake is still hot.