Buckhead Diner White Chocolate Banana Cream Pie

Source: Buckhead Diner - Atlanta, Georgia (as found in Bon Appetit Archives)

Pastry Cream
1 cup milk
1/2 vanilla bean, split lengthwise
3 large egg yolks
1/3 cup granulated sugar
2 tablespoons cornstarch
1 tablespoon chilled unsalted butter, cut into pieces
3 ounces imported white chocolate
    (such as Lindt), finely chopped

Bring milk and vanilla bean to boil in heavy medium saucepan.

Whisk yolks and sugar in medium bowl until pale and thick. Whisk in cornstarch. Whisk 1 cup milk into yolk mixture. Return mixture to saucepan and whisk until custard boils and thickens, about 30 seconds. Pour into bowl. Whisk in butter, then white chocolate. Press plastic wrap onto surface of pastry cream to prevent skin from forming. Refrigerate until well chilled. (Can be prepared up to 2 days ahead.)

Sweet Pastry
1/2 cup chilled unsalted butter, cut into pieces
1/4 cup plus 1 1/2 teaspoons granulated sugar
2 teaspoons beaten egg
1 cup plus 2 tablespoons unbleached flour
4 ripe bananas, peeled and sliced
1 tablespoon fresh lemon juice
1 1/2 tablespoons banana liqueur
1 1/2 tablespoons white cr