Recipe Black Ice

Ingredients
4 tablespoons all-purpose flour
2 cups milk
1 cup sweetened condensed milk
1 teaspoon vanilla extract
1/2 cup sifted cocoa
2 tablespoons cornstarch
1 teaspoon baking soda
2 tablespoons vegetable oil

Directions
Combine the flour, milk, sweetened condensed milk, vanilla, cocoa powder, cornstarch, baking soda and oil blending until smooth.
Microwave on high for 4 minutes, stir then microwave on high for another 4 minutes. Or cook over in the top half of a double boiler for 25 minutes or until thick. Spread on cake while hot. For piped borders, let frosting cool then pipe.