Ho Ho Cake
["1 box chocolate cake mix", "5 Tbsp. flour", "1 1/4 c. milk", "1 c. sugar", "1/2 c. Crisco shortening", "1 stick margarine, softened", "2 tsp. vanilla", "1 stick margarine, melted", "1 egg", "2 1/2 Tbsp. hot water", "3 c. powdered sugar", "3 pkg. premelted chocolate"]
["Bake cake as directed in", "jelly roll pan or cookie sheet at 350\u00b0 for 15 to 20 minutes.", "Cool.", "Mix flour and milk together. Cook until thick and cool completely.", "Cream sugar, shortening, vanilla and softened margarine together until smooth.", "Spread on cooled cake and refrigerate for 1 hour."]
["chocolate cake mix", "flour", "milk", "sugar", "shortening", "margarine", "vanilla", "margarine", "egg", "water", "powdered sugar", "chocolate"]