01 -
Set your oven to 350°F and let it warm up.
02 -
Roll out half of your dough into a round shape. Line a 9-inch pie tin with it and trim the edges neatly.
03 -
In a big mixing bowl, stir together the sugar and cornstarch. Add in the frozen berries and lemon juice, gently tossing to coat the fruit evenly.
04 -
Spoon the berry mixture into your prepared bottom crust, spreading it out evenly across the surface.
05 -
Flatten the rest of your dough. You can either cut it into strips for a lattice design or leave it intact, adding slits for steam to escape.
06 -
Brush the edges of the bottom crust with the egg wash. Add the top crust, snipping off any extra, and pinch or crimp the edges as you prefer.
07 -
Paint the top crust with the egg wash, then scatter a little sugar over it for a nice finish.
08 -
Pop it in the oven for about an hour and 15 minutes. Look for a golden crust and a bubbling filling in the center. If it browns too quickly, cover with foil.