Cooked Cake Icing - cooking recipe

Ingredients

1 c. milk, divided
5 Tbsp. flour
1 c. sugar
1 1/2 tsp. vanilla
1 c. butter

Preparation

Put 1/2 of milk in double boiler; heat and use other half with flour to make a paste.
Put paste into heated milk and cook until very thick and heavy, almost like a ball, stirring constantly.
Let cool until thoroughly cold.
Put in mixer and add the remaining ingredients.
Beat until fluffy.