Hi,
I think I have the recipe that you're looking for! It is called "Poor Man's Frosting"
1 cup milk, 1 cup Crisco, 5 TBSP. flour, 1 cup granulated sugar. Cook milk and flour together until thick. Set aside to cool. Cream together Crisco and sugar until light and fluffy. Beat in milk mixture until fluffy. You may add 1 teaspoon of vanilla or any other flavoring. You can also add cocoa in case you want a chocolate frosting.
I think this is the one you want. It is a very very old recipe.
Judy