Cherry Berry Eat More Pie

Blend flour, sugar and salt in processor. Add butter and shortening and cut in using on/off turns until mixture resembles coarse meal. Add 6 tablespoons ice water and process until moist clumps form, adding more water by teaspoonfuls if rnrndough is dry. Gather into ball, divide, then flatten into two disks. Wrap in plastic; chill 2 hours.
Preheat oven to 375F. Spray a 9 inch pie plate with baking spray.
Place berries and cherries in a medium work bowl. Sprinkle in corn starch and sugar and stir to combine. Set aside.
Roll out one of the dough disks to a 12 inch circle. Place in pie plate and crimp edges. Dock the pastry with a fork a few times, all the way to the edges. Spoon cherry-berry mixture onto the pie plate. Roll out the other dough disk to a rnrnlong sheet and cut bands. Create a lattice top over the pie and anchor to the crust. Lightly brush pastry with the beaten egg wash. Place on a baking sheet (in case it boils over) and place on the center rack in the oven.
Bake until filling is bubbling and pastry is golden, 55 minutes to an hour. If the top gets too brown before the hour, cover with aluminum foil. Cool slightly on baking sheet on a rack. Serve warm or at room temperature.