Chocolate Sheet Cake
["2 c. flour", "2 c. sugar", "1 stick butter", "1 c. water", "1/4 c. cocoa", "1/2 c. shortening", "1/2 c. buttermilk", "2 eggs, beaten", "1 tsp. soda", "1 tsp. vanilla"]
["Heat butter, water, cocoa and shortening in saucepan until it comes to a boil.", "Pour over flour and sugar mixture; stir by hand until mixed.", "Add buttermilk, eggs, soda and vanilla; mix well. Bake in a large cookie sheet pan that has at least 1-inch sides. Bake at 350\u00b0 for 20 minutes.", "While cake is baking, make the icing."]
["flour", "sugar", "butter", "water", "cocoa", "shortening", "buttermilk", "eggs", "soda", "vanilla"]