Maybe not the best pie reference BUT that was the first time I'd seen a chocolate pie made and served like the one in "The Help". I used my basic custard recipe and just added cocoa with a big dollop of freshly whipped cream in the center. It was a "bake in shell" pie and was an amazing surprise how delicious it was. It's my new standard chocolate pie - compared to a boiled custard with meringue on top.
No special ingredients. :)