01 -
Combine flour, salt, and sugar in a large bowl. Add butter and shortening; cut in until mixture resembles coarse crumbs. Gradually add ice water, mixing just until dough forms. Divide into two discs, wrap, and chill at least 2 hours.
02 -
On a floured surface, roll out one dough disc to 30 cm diameter. Transfer to 23 cm pie dish, trim edges leaving a small overhang. Refrigerate while preparing filling.
03 -
In a large bowl, toss blueberries with sugar, cornstarch, flour, cinnamon, lemon zest, and juice. Press some berries to absorb dry ingredients evenly.
04 -
Pour filling into crust, spread evenly, and dot with cubed butter.
05 -
Roll out second dough disc to 30 cm. Cut into strips for lattice or leave whole for solid top. Arrange over filling, trim excess, and crimp edges.
06 -
Beat egg with milk and brush over top crust. Optionally sprinkle with coarse sugar.
07 -
Refrigerate assembled pie for 15–20 minutes to ensure cold dough before baking.
08 -
Preheat oven to 218°C. Place lined baking sheet below pie. Bake 25 minutes at 218°C, then reduce to 190°C, shield crust edges, and bake 50–55 minutes until filling bubbles and crust is golden brown.
09 -
Transfer pie to wire rack and cool at room temperature at least 4 hours to set filling before slicing.