Chocolate Icing - cooking recipe

Ingredients

1 c. evaporated milk
1 stick butter or margarine
1/4 c. chocolate cocoa
3 c. sugar
1 tsp. vanilla flavoring

Preparation

Mix cocoa and sugar.
Add milk and butter (do not melt butter).
Stir together.
Heat to boil in thick boiler.
Boil for 4 1/2 minutes.
Do not stir after it starts boiling.
Maintain a rolling boil, but do not burn.
Place in sink of cold water; add flavoring.
Stir until icing begins to thicken.
Spread on layers. If icing becomes too thick, add a little water.
Will ice four layers.