NEAPOLITAN RICOTTA AND WHEATBERRY PIE

Steps:

• Cover wheat berries with cold water in a bowl, then chill, covered, 8 to 12 hours. Drain in a sieve and rinse.
• Make pastry while wheat berries soak:
• Sift together 2 1/4cups flour, 1/4 cup sugar, baking powder, and 1/2teaspoon salt. Blend in 1 1/4sticks butter (1/2 cup plus 2 tablespoons) with a pastry blender or your fingertips until mixture resembles coarse meal. Add 2 whole eggs and stir with a fork until a crumbly dough forms.
• Turn dough out onto a work surface. Divide in half and with heel of your hand smear each piece of dough twice with a forward motion to help distribute fat. Gather dough and form into 2 disks. Chill, wrapped in plastic wrap, until firm, at least 1 hour.
• Make filling:
• Bring soaked wheat berries and cold water to a boil in a 2-quart saucepan, then reduce heat and simmer, covered, until wheat berries are tender, about 1 1/2 hours. Add remaining 1/2 teaspoon salt and simmer 5 minutes more. Drain in sieve and rinse under cold water until cool. Drain well.
• Whisk together 2 yolks and 1/4 cup sugar, then whisk in cornstarch and remaining 3 tablespoons flour until smooth. Bring milk to a boil in a small heavy saucepan, then gradually add hot milk to yolks, whisking.
• Pour custard into saucepan and bring to a boil over moderately low heat, whisking constantly (custard will get very thick), then boil, whisking, 1 minute. Remove from heat and whisk in vanilla and remaining 1/4 stick (2 tablespoons) butter. Transfer pastry cream to a bowl and chill, its surface covered with wax paper.
• Beat together ricotta and remaining 1/3 cup sugar with an electric mixer at medium speed until sugar is dissolved, about 3 minutes. Beat in flower water, pastry cream, and remaining 2 yolks, then stir in zest, citron, cinnamon, and wheat berries.
• Assemble and bake pie:
• Preheat oven to 350°F.
• Roll out half of dough into a 13-inch round on a well-floured surface with a floured rolling pin. Fit dough into a 9-inch (24-centimeter) springform pan (dough is very tender and will crack). Press dough against side of pan and patch any cracks. Chill.
• Lightly beat remaining egg. Roll out remaining dough into a 10-inch round and transfer to a baking sheet. Brush dough with some of egg, then cut into 10 (1-inch) strips with fluted pastry wheel.
• Spoon filling into chilled pie crust (filling will not reach top of crust).
• Arrange 5 dough strips vertically on filling (1 inch apart), pressing ends of strips into crust. Arrange remaining 5 strips over them in same manner to form a diagonal lattice. Trim crust 1/2 inch from top of filling, then fold over lattice. Brush edge with some of egg.
• Bake pie in middle of oven until pastry is golden and filling is puffed and set, about 1 1/2 hours, covering top of pie with foil after 50 minutes to prevent over-browning. Transfer to a rack to cool. Run a thin knife around edge of pie and remove side of pan. Chill pie at least 2 hours. Bring to room temperature before serving.