A Tradition in the South. Pour this frosting over a cooled yellow cake in which holes have been poked to allow all the goodness to saturate the cake. The frosting firms up after cooling and makes a wonderful cake topping.
Mix sugar and cocoa together in saucepan. Stir in milk. Add butter. Cook over low heat and stir until butter melts. Continue to cook over low heat until mixture comes to a rapid boil. Cook 3 minutes more. Remove from heat. Add vanilla. Place pan in cold water and continue to stir until it begins to thicken. Pour over 9 x 13 cake in which holes have been punched with a toothpick, fork or skewer.