In a large saucepan over medium heat, stir together the sugar, cornstarch and salt. Pour in the milk, then the beaten eggs. Cook, stirring, until the mixture comes to a boil. Remove from the heat and add the chocolate, butter and vanilla. Stir until the chocolate is all melted. Pour into the baked pie shell and chill in the fridge for several hours until set.
Serve plain to Ladd, serve topped with everything for Ree!