Boiled Chocolate Icing - cooking recipe

Ingredients

3 c. sugar
3/4 c. milk
1 tsp. vanilla
1/2 c. cocoa
1 stick margarine

Preparation

Put sugar, milk and cocoa in a heavy saucepan.
Cook and stir until mixture cannot be stirred down.
Put lid on; cook 1 minute over medium heat.
Remove and add 1 stick butter and 1 teaspoon vanilla.
Stir.
Frost cake.