Icing For Moist Chocolate Cake
["1 c. milk", "5 Tbsp. flour", "1/2 c. butter, softened", "1/2 c. shortening", "1 c. sugar", "1 tsp. vanilla"]
["Combine milk and flour.", "In a saucepan, cook until thick. Cover and refrigerate.", "In a mixing bowl, beat butter, shortening, sugar and vanilla until creamy.", "Add chilled milk and flour mixture and beat for 10 minutes.", "Frost cooled cake."]
["milk", "flour", "butter", "shortening", "sugar", "vanilla"]