Shiny Chocolate Icing

3/4 cup white sugar
1 tablespoon margarine
1 tablespoon cocoa
1 teaspoon vanilla
2 tablespoon cornstarch
1 cup hot water

Mix sugar, cocoa and cornstarch in saucepan. Add hot water and bring to a boil on medium heat.  Remove from heat and add margarine and vanilla.  Cool completely before frosting.  (Double this recipe for a two layer cake).