Step 1Combine the flour and sugar in a food processor or mixer. With the machine running, slowly add the butter, and process or mix until you have a fine meal. Mix together the yolks and the cream, and slowly add it into the flour mixture. Process until the dough just starts to come together.
Step 2Turn the dough onto a floured work surface; workwith the heel of your palm until it comes together flat and smooth. Form the dough into 8 small disks. Wrap in plastic wrap and refrigerate 2 hours.
Step 3Butter 8 (4-inch) tart pans. (If you only have 4 pans, you can make 4 shells at a time.) Roll the disks out to 1/8 inch thick. Form the dough into the tart pans. Use a rolling pan to roll over the tops of the pans until the excess dough drops from the sides. Press the dough gently to the sides of the pans. You must chill and weigh down the dough. The easiest way is by spraying a coffee filter with cooking spray and filling it with dried beans, then placing it on top of the pastry dough. Chill the shells for at least another 2 hours.
Step 4Heat the oven to 400 degrees.
Step 5Bake the shells (coffee-filter bags and beans still on top) until they become light amber, 15 to 20 minutes. Remove the coffee filters and let the shells cool to room temperature. Carefully remove the shells from the pans.
Step 1Beat the egg yolks and sugar until the mixture is pale and forms ribbons when the beaters are lifted from the bowl. Sift in the cornstarch and flour, mixing well.
Step 2Heat the milk in a saucepan over medium heat. Split and scrape the vanilla bean and place in the milk. Once the milk comes to a boil, remove the bean, then slowly whisk about 1/4 of the milk into the egg mixture, then whisk rapidly to incorporate and not curdle the eggs. Return the mixture to the milk in the saucepan. Cook over medium-low heat, stirring constantly, until the mixture becomes thick and bubbles, 6 to 8 minutes. Cover the cream with plastic wrap, pressing it flat across the cream's surface so no skin forms, and refrigerate 1 hour.
Step 1Place the cream, butter and vanilla bean in a saucepan over low heat until the butter melts. Set aside.
Step 2Heat the corn syrup in a deep, heavy saucepan over medium-high heat until it just starts to bubble, about 3 minutes, then slowly sprinkle in the sugar, stirring with a wooden spoon. Once the sugar has been incorporated, stir a bit slower, allowing the mix to become a very light amber, then straw-colored, about 8 to 10 minutes. Remove from the heat.
Step 3Remove the bean from the cream mixture and discard; add the cream mixture to the corn syrup mixture, being careful not to burn yourself from the splattering. Return the sauce to high heat and cook until the sugar completely dissolves, 2 to 3 minutes.
Step 4Pour the sauce into a heat-proof container, stirring once or twice over the next 5 minutes to prevent further cooking.
Step 1Place about 1 tablespoon of the Pastry Cream in the bottom of each shell. In a large mixing bowl, fold the remaining Pastry Cream in with 3/4 of the whipped cream. Gently fold in the bananas. Fill each shell just to the top. Place a large dollop of the whipped cream on top to cover.
Step 2Place the Caramel Sauce in a squeeze bottle, or use a metal spoon to make a zig-zag of sauce across each plate. Place the pies on top. Drizzle or squeeze the sauce in a zig-zag on top of each pie.