2 ½ cups all-purpose flour, plus additional for rolling dough
2 tablespoons granulated sugar
½ teaspoon kosher salt
1 cup salted butter, frozen
⅓ to ½ cup cold water
¼ cup fresh sage leaves, finely chopped
8 cups fresh or frozen blackberries
¼ cup minute tapioca
1 cup granulated sugar
¼ teaspoon ground cinnamon
¼ cup honey
3 tablespoons lemon juice
2 tablespoons salted butter
1 large egg
Directions
Prepare the pie crust: Stir 2 ½ cups flour, sugar, and salt to combine.
Grate frozen butter using the large holes of a box grater.
Add butter and sage to flour mixture and toss to combine.
Add ⅓ cup water and lightly mix to incorporate. If the dough is too dry, add remaining water.
Turn dough out onto a clean surface and lightly knead to form a ball.
Divide dough into 2 sections.
Form each into a flattened disk, wrap with plastic, and refrigerate for 1 hour.
Lightly dust a clean surface with flour and roll 1 disk to a 12-inch circle about ⅛ to ¼ inch thick.
Transfer dough to a 9-inch pie pan and trim to leave 1 inch of overhang. Save dough scraps.
Fold dough under itself around the edges to form a neat crust.
Crimp edges as desired.
Preheat oven to 375 F.
Prepare the filling: Use a spice grinder or food processor to grind tapioca into a fine flour.
In a small bowl, stir ground tapioca, sugar, and cinnamon to combine.
Place blackberries into a large bowl and add the tapioca mixture, honey, and lemon juice. Toss to combine, then set aside for 15 minutes.
Meanwhile, dust a clean surface (or a piece of parchment paper) with flour and roll out remaining pie dough to a ⅛-inch thickness.
Cut half the dough into 1-inch strips, then use leaf cutters to cut remaining dough into leaf shapes. Remove and save dough scraps.
Pour blackberry filling into prepared pie crust. Dot with butter.
Top about ⅔ of the pie with a lattice pattern using the 1-inch dough strips. Top the remaining portion of pie with leaf shapes.
Re-roll dough scraps and cut additional leaves or strips as needed to finish topping the pie.
Whisk egg with a splash of water and brush over the crust.
Sprinkle with coarse sugar if desired.
Place pie onto a parchment-lined baking sheet.
Bake for 75-90 minutes until crust is golden brown and berry juice begins to bubble along the edge of the crust. Transfer to a rack to cool for at least 30 minutes.
Serve sliced pie warm with scoops of vanilla ice cream or dollops of whipped cream, and/or an additional drizzle of honey, if desired.