For the crust:

• 3 ½ cups (420 gm) all-purpose flour
• 3 teaspoons (12 gm) sugar
• 3/4 teaspoon (4 gm) salt
• 2/3 cup (135 gm) chilled solid vegetable shortening, cut into pieces
• 3/4 cup (1–1/2 sticks, 170 gm) chilled unsalted butter, cut into pieces
• 10 tablespoons (approximately) ice water

For the filling:

• 4 cups fresh or frozen blueberries
• 1 cup pure maple syrup
• 1 tsp lemon zest (from about 1 lemon)
• 1–1/2 tablespoons lemon juice (from about 1 lemon)
• ¼ cup cornstarch
• ¼ cup all-purpose flour
• ¾ teaspoon cinnamon
• ¼ teaspoon salt

For the egg wash:

• 1 egg
• 2 teaspoons sugar

Instructions

To prepare the crust:

1. Give the dry ingredients a whiz in the food processor to combine.
2. Pulse in the shortening and butter, just until barely evenly dispersed.
3. Begin adding ice water, 2 tablespoons at a time until moist clumps begin to form.
4. Remove dough from food processor and separate in two flat round disks. Wrap in Saran wrap and chill for at least two hours prior to use.

 To prepare the pie:

1. Preheat the oven to 375 degrees. I also like to preheat a baking steel or heavy-duty sheet pan on the bottom third of the oven- this is recommended for a crisp-bottomed crust. 
2. In a large bowl, combine the filling ingredients. Set aside while you roll out your pie dough.
3. On a floured surface, roll out one half of the chilled pie dough to a 1/8-1/4” thick round approximately 1” wider on all sides than the lip of your standard pie pan. Roll the dough onto a floured rolling pin and unroll into the pan. Gently work the dough into the bottom and sides of the pan. Leave about 1” of dough extending outside the perimeter of the dish and trim off any excess.
4. Pour the fruit mixture into the pie dish. Place in the fridge while you prepare you pie top. Latticing is optional here; if you plan to leave a plain single sheet of dough on top of the filling, be sure to vent the top with a couple of slits from your knife. Crimp the edges once finished.
5. In a small both, whisk together the egg and use a pastry brush to paint a thin layer of the egg wash on the top of the pie crust. Sprinkle with the sugar. Place the pie on the preheated baking sheet and bake for 45 minutes. At that time, check the crust; if the edges are looking too done, make a pie collar out of aluminum foil to gently drape the edges of the pie.  degrees. Continue baking for an additional 20-30 minutes, or until the middle of the pie has bubbling juices underneath and the top of the pie crust is golden brown. Allow the pie to cool on a cooling rack completely, or overnight. Cutting into the pie too soon can cause the pie to be too runny, but if this doesn’t bother you, you can cut into it as soon as it is a manageable and safe temperature. Serve with ice cream if desired!