Crust
2 cups flour
12 tablespoons butter, chilled and cut into pieces
2 tablespoons heavy cream, chilled
2 tablespoons apple cider vinegar, chilled
2 tablespoons ice water

Filling
4 cups blueberries
2 tablespoons lime juice
1/4 cup sugar
1/4 cup flour
1 tablespoon cornstarch
1 teaspoon cinnamon
1 teaspoon vanilla

Assembly
3 tablespoons butter
1 tablespoon heavy cream

For the crust: In a food processors, pulse the butter and flour until it resembles a coarse meal. With the processor on, slowly add the cream, vinegar, and ice water until the dough begins to hold together. Press the dough into a rough ball, then transfer to a lightly floured surface. Knead the dough a few times until smooth. Flatten dough into a disk. Wrap disk in plastic wrap and refrigerate for 1 hour.

For the filling: Toss blueberries with lime juice, sugar, flour, cornstarch, cinnamon, and vanilla in a bowl. Set aside.

For the pie: Preheat oven to 375°F. Set aside 1/4 of the pie dough. Roll the rest out on a lightly floured surface into an 11″ round, then fit it into a 9″ pie plate. Transfer filling to pastry bottom and scatter the 3 tablespoons of butter over fruit. Roll the remaining 1/4 of dough out on the lightly floured surface and cut out shapes for the top. Place on top of filling. Brush crust and cut-outs with 1 teaspoon cream. Bake until pastry is deep golden (cover edges of crust with foil if browning too quickly), 60–70 minutes. Set pie aside to cool for several hours before serving.