Chocolate Glass Frosting - cooking recipe

Ingredients

1 cup granulated sugar
1 cup water
6 tablespoons cocoa powder
3 tablespoons cornstarch
3 tablespoons butter or 3 tablespoons margarine
1/4 teaspoon salt
1 teaspoon vanilla

Preparation

Combine all ingredients except vanilla in medium saucepan. Heat over medium heat, stirring constantly until mixture boils and thickens.
Remove from heat, stir in vanilla.
Spread over warm chocolate sheet cake or 9x13 cake.