Arrange the oven rack on the middle of the oven cavity. Set a baking sheet on the oven rack. Preheat oven to 350ºF (177ºC).
Roll pie crust out to about 12 inches then roll up around the rolling pin and transfer to a standard metal 9-inch pie plate. Unroll and shape into the pie plate. Do not trim the crust at this time.
Prick the bottom and sides of the crust with a fork. Brush the entire inside of the crust with an egg white. Chill until crust is firm, at least 1 hour.
In a large mixing bowl, gently toss, with a large rubber spatula or wooden spoon, the pears (6-7) and lemon juice (1 tablespoon).
In another mixing bowl, whisk together sugar (1/3 cup white + 1/4 cup brown sugar), flour (3 tablespoons), cornstarch (2 tablespoons), nutmeg (1/4 teaspoon), ginger (1/2 teaspoon), cinnamon (1 teaspoon), lemon zest (1 teaspoon), and salt (1/4 teaspoon) until well combined. Sprinkle over pears and very gently fold until the pears are evenly coated. Pour filling into pie shell. Dot with butter (2 tablespoons). Put back in the fridge while you prepare the second crust.
Roll out the second crust, on a lightly floured counter, into a 12-inch circle. Cut into 12, 3/4 inch strips with a knife or pastry wheel.
Arrange strips in a tight lattice pattern. Trim excess off ends of dough off strips flush with the overhang of the bottom crust. Fold lattice ends and bottom crust under. Pinch the edges using your thumb and forefinger knuckle or crimps with a fork.
Brush the lattice top with heavy cream (1-2 tablespoons) and sprinkle with coarse sugar (1-2 tablespoons). Refrigerate the pie, before baking for about 30 minutes.
Place the pie plate on the rimmed baking sheet that has been heating in the oven. Bake the pie in preheated oven, until the crust is golden brown and the juices of the pie have slow bursting bubbles in the center of the filling, about 50-60 minutes. If the crust begins to brown too quickly, cover loosely with aluminum foil.
Transfer the pie from the oven to a wire baking rack. Cool completely on the rack, for at least 3 hours, before cutting and serving. This allows the filling to set up so it won’t fall apart when slicing.