Creamy White Cake Icing
["2 tbsp. flour", "1/2 cup milk", "1/4 cup shortening", "1/4 cup butter", "1/2 cup sugar", "vanilla (opt.)"]
["Make paste with flour and milk.", "Cook and cool.", "Add shortening, butter, sugar.", "Beat until spreading consistency.", "May add 1/4 tsp. vanilla if desired."]
["flour", "milk", "shortening", "butter", "sugar", "vanilla"]