-
Place wheat in a medium bowl. Add enough water to cover by 2 inches. Refrigerate overnight. Drain, and transfer to a medium saucepan. Add milk,1 cup water, butter, and salt. Bring to a boil. Reduce to a simmer, and cook until tender, about 1 hour. Drain, and spread on a baking sheet. Let cool, about 30 minutes.
-
Preheat oven to 375 degrees. In a medium bowl, stir together ricotta and sugar. Add cooled wheat, and pastry cream. Stir to combine.
-
Remove the larger piece of dough from refrigerator. On a lightly floured surface, roll into a 16-inch circle, about 1/8 inch thick. Fit into a 12-by-2-inch cake pan. Pour filling into the crust; set aside. On a lightly floured surface, roll out remaining piece of dough, 1/8-inch-thick. Cut into 3/4-inch lattice strips. Weave the lattice strips over the filling, pinching edges to seal. Crimp edges as desired.
-
Brush top of pie evenly with egg wash. Transfer to oven, and bake, rotating halfway through, until crust is golden and filling is bubbling, 1 to 1 1/2 hours.