Chocolate Frosting - cooking recipe

Ingredients

3 sticks margarine
3/4 c. cocoa
1 1/4 c. milk
1/4 tsp. salt
2 1/2 Tbsp. vanilla
3 1/2 lb. powdered sugar

Preparation

Melt margarine and add cocoa; simmer.
Add milk, salt and vanilla.
Simmer for 7 to 8 minutes.
Add this mixture to powdered sugar.
Beat until cool.
Spread on cake.