Chocolate Frosting - cooking recipe

Ingredients

1 1/2 c. sugar
4 1/2 Tbsp. cornstarch
3 (1 oz.) sq. unsweetened chocolate, grated
dash of salt
1 1/2 c. boiling water
4 1/2 Tbsp. margarine
1 1/2 tsp. vanilla flavoring

Preparation

Mix sugar and cornstarch; add chocolate and salt.
Add water. Cook in heavy saucepan until mixture thickens.
Remove from heat. Add butter and vanilla.
Spread on cake while hot.