Hot Fudge - fine, okay it's "Icing" (feel better?)
1/2 cup (1 stick) butter
1/4 cup Dutch processed cocoa powder
6 tablespoons milk
1 pound powdered sugar, sifted
1/2 teaspoon vanilla
Melt the butter, add the cocoa, milk, and vanilla. Mix in the powdered sugar.
Recipe Source: http://baking.about.com/od/frostingsandicings/r/hotfudgeicing.htm