1 c. milk
4 tbsp. flour
1 stick butter
1/2 c. shortening
1 c. sugar
2 tsp. vanilla

Mix flour and milk together. Heat over medium heat until thickness of Elmer's Glue. Let cool. Blend together butter, shortening and sugar. (Mix well.) Blend in flour mixture and again beat well. Add vanilla, mix 2 minutes more. Refrigerate for 1/2 hour before icing cake.