Cookie Sheet Cake
["2 c. sugar", "2 c. plain flour", "1/2 tsp. salt", "1 c. water", "1/2 c. Crisco", "1 stick butter", "3 Tbsp. cocoa", "2 eggs", "1/2 c. buttermilk", "1 tsp. vanilla flavoring"]
["Pour into a 13 x 17-inch cookie sheet.", "Bake at 350\u00b0 for 20 minutes.", "Frost while cake is still warm."]
["sugar", "flour", "salt", "water", "Crisco", "butter", "cocoa", "eggs", "buttermilk", "vanilla flavoring"]