Caramel Cake Icing - cooking recipe

Ingredients

1 box brown sugar
1 c. white sugar
1 stick margarine
1 tsp. vanilla
1 small can Pet milk

Preparation

Mix ingredients in a 2-quart saucepan and place on medium heat, stirring occasionally until it comes to a rolling boil.
Let it boil for 1 minute on rolling boil, then remove from stove and let stand about 10 minutes.
Beat until smooth and begins to thicken.