½cuppacked light brown sugarpressed through a sieve
1/3cupcornstarchsifted
½teaspoonground cinnamon
1/8teaspoonfreshly ground nutmeg
1Pinchof salt
1teaspoonpure vanilla extract
3tablespoonscold unsalted buttercut into bits
3ripe but firm bananas
19-inchsingle crustfully baked and cooled
For the Topping:
1cupcold heavy cream
2tablespoonsconfectioners’ sugarsifted
1teaspoonpure vanilla extract
2tablespoonssour cream
Instructions
To Make the Custard:
Bring the milk to a boil.
Meanwhile, in a large heavy-bottomed saucepan, whisk the yolks together with the brown sugar, cornstarch, cinnamon, nutmeg and salt until well blended and thick.
Whisking without stopping, drizzle in about ¼ cup of the hot milk – this will temper, or warm, the yolks so they won’t curdle – then, still whisking, add the remainder of the milk in a steady stream. Put the pan over medium heat and, whisking constantly, bring the mixture to a boil. Boil, still whisking, for 1 to 2 minutes before removing from the heat.
Whisk in the vanilla extract. Let stand for 5 minutes, then whisk in the bits of butter, stirring until they are fully incorporated and the custard is smooth and silky.
You can either press a piece of plastic wrap against the surface of the custard to create an airtight seal and refrigerate the custard until cold or, if you want to cool the custard quickly put the bowl into a large bowl filled with ice cubes and cold water and stir occasionally until the custard is thoroughly chilled, about 20 minutes.
When you are ready to assemble the pie, peel the bananas and cut them on a shallow diagonal into ¼-inch-thick slices.
Whisk the cold custard vigorously to loosen it, and spread about one quarter of it over the bottom of the piecrust – it will be a thin layer. Top with half of the banana slices.
Repeat, adding a thin layer of pastry cream and the remaining bananas, then smooth the rest of the pastry cream over the last layer bananas.
To Make the Topping:
Beat the cream until it just starts to thicken. Beat in the confectioner’s sugar and vanilla and continue to beat until the cream holds firm peaks. Switch to a rubber spatula and gently fold in the sour cream.
Spoon the whipped cream over the filling and spread it evenly to the edges of the custard. Serve, or refrigerate until needed.
Notes
Serving: I like to serve the pie as soon as it is assembled, when the pastry cream and whipped cream are cold but not really chilled and the crust has not been refrigerated. I think this is when the pie is at its best – but, trust me, it will still be wonderful if you serve it from the fridge. For me, this is a go-with-coffee pie.Storing: The pastry cream can be made ahead, and you can keep the assembled pie in the fridge for a few hours.