Texas Sheet Cake
["2 c. flour", "2 c. sugar", "1 tsp. cinnamon", "1/4 tsp. salt", "1 stick margarine", "1/2 c. shortening (Crisco)", "4 Tbsp. cocoa", "1 c. water", "1/2 c. buttermilk", "1 tsp. vanilla", "1 tsp. baking soda", "2 eggs"]
["Sift together first 4 ingredients.", "Bring to boil in saucepan margarine, shortening, cocoa and water.", "Remove from heat; add dry ingredients, then add buttermilk, vanilla, baking soda and eggs. Beat and pour into greased and floured large cookie sheet.", "Bake at 400\u00b0 for 20 minutes.", "During last 5 minutes of baking time, make frosting as follows."]
["flour", "sugar", "cinnamon", "salt", "margarine", "shortening", "cocoa", "water", "buttermilk", "vanilla", "baking soda", "eggs"]