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

In saucepan, add a little milk to flour, stirring until lumps are gone. Add remaining milk. Cook, stirring constantly until thick. Cool. Chill in refrigerator until very cool. Add remaining ingredients and beat well. Spread between layers and on top and sides. Make sure that shortening used on icing is not soft. It's best to use straight from refrigerator.