Can't say where I first came across this but it's been made by me for, well longer than I care to admit and I'm older than I care to admit. That said, it's a keeper! It's cocoa...rich, dark, silky cocoa--'nuf said! I can't remember where I found it, or when I first made it but I've made it for half a century so I reckon it's mine to share at this point. Dig in, it's not a sin...just plain good!
This is a delightfully easy pie to construct. Use a store bought crumb crust for the easiest way. I make my own and I'm sure you must have a delightful family crust recipe. If not, use a baked pastry shell and save yourself some clean up.
Combine coca, sugar, cornstarch, and salt in a saute pan. When thoroughly combined, stir half and half into it and blend until combined. NOTE: originally had heavy cream and skim milk but tested with all half and half and it is just as good and easier to use!
Set over medium high heat and stir continually until mixture comes to a low controlled simmering boil. Let it low boil for 1 minute. Remove from heat. Stir in butter and vanilla and pour into prepared crust.
Cover filling with plastic (like Saran) and cool for a while before putting in refrigerator. When thoroughly chilled, Cut and serve with whipped cream.