Aunt Dawn's Hot Fudge Sauce

2 cups sugar
4 Tbsp flour
4 Tbsp cocoa
4 Tbsp butter
1 can evaporated milk
1 tsp vanilla

Mix sugar, flour, and cocoa well over medium heat.  Slowly add butter and evaporated milk.  Turn up the heat to a boil.  Boil for 3 minutes.  Remove from heat and add vanilla.