Old Fashioned Fudge

Mix sugar and cocoa in a saucepan, then add a stick of butter and the can of evaporated milk, and stir until the mixture starts boiling.
Stir continuously for 7 minutes, then remove from heat and add vanilla, then stir the mix continuously for 3 minutes, then pour into a buttered baking dish to set.
Great fudge in less than 20 minutes!