In a medium saucepan combine the sugar and cocoa and salt, then mix in milk

Heat to just boiling with medium-high heat. When bubbling, reduce heat just enough to keep it bubbling.

I don't have a thermometer so I use a small dish of cold water to test mixture, you want it to get to a medium-ball stage. This takes about 20 to 25 minutes.

Remove from heat and add the vanilla and butter. Stir and stir until the mixture cools slightly and loses it's sheen, then pour into a buttered pie pan to cool completely. Enjoy!