Mix together sugar, flour and salt . Place butter, cocoa, shortening and water in a saucepan and bring to a boil. When it reaches a boil, add flour and sugar. Beat together. Mix buttermilk with baking soda. Then add eggs, buttermilk mixture and vanilla. Beat until smooth. Grease and flour pan (10x15-inch) Pour batter into pan, and bake at 350°F for 20 minutes.
Chocolate Frosting:
Heat butter, milk and cocoa in saucepan for about 5 minutes before cake is done. Then add vanilla and powdered sugar to mixture; stir together. Frost cake when you take it from the oven.
Instructions
Mix together sugar, flour and salt . Place butter, cocoa, shortening and water in a saucepan and bring to a boil. When it reaches a boil, add flour and sugar. Beat together. Mix buttermilk with baking soda. Then add eggs, buttermilk mixture and vanilla. Beat until smooth. Grease and flour pan (10x15-inch) Pour batter into pan, and bake at 350°F for 20 minutes.
Chocolate Frosting:
Heat butter, milk and cocoa in saucepan for about 5 minutes before cake is done. Then add vanilla and powdered sugar to mixture; stir together. Frost cake when you take it from the oven.
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