1 1/3 C chocolate wafer crumbs
5 T unsalted butter, melted
1/4 C sugar
Preheat oven to 350. Stir ingredients together and press in bottom and up sides of a 9-inch pie plate. Bake until crisp, about 15 minutes, and cool on a rack.
2/3 C sugar
1/4 C cornstarch
1/2 t salt
4 large egg yolks
3 C whole milk
5 oz bittersweet chocolate, melted
2 0z unsweetened chocolate, melted
2 T unsalted butter, softened
1 t vanilla
Whisk together sugar, cornstarch, salt, and yolks in a 3 qt. heavy saucepan until combined well, then add milk in a stream, whisking. Bring to a boil over moderate heat, whisking, then reduce heat and simmer, whisking, 1 minute (filling will be thick).
Whisk in chocolate, butter, and vanilla. Cover surface with a buttered round of wax paper and cool completely, about 2 hours.
Spoon filling into crust and chill pie, loosely covered about 6 hours.
3/4 C chilled heavy cream
1 T sugar
Just before serving beat cream with sugar until it holds stiff peaks, then spoon on top of pie.