Chocolate Sheet Cake

In a medium bowl mix 1/2 c buttermilk, 2 well beaten eggs, 1t vanilla In a medium bowl sift together 2 Cups flour, 1 t baking soda and 2 Cups sugar - set aside In a medium saucepan mix 8T butter, 1/2 cup crisco, 4T cocoa, 1 cup water bring to a boil and then alternately add flour and buttermilk mixture Pour into 11*17 greased pan (jelly roll pan) Bake at 400 for 15-18 mins Frosting 8T butter 4T cocoa 1/3 c milk 1 box powdered sugar 1t vanilla Bring butter, cocoa, and milk to a boil. Remove from heat and add powdered sugar and vanilla. Frost while hot.