Blueberry Crumble Pie

Bahan-bahan (8 porsi)

• homemade pie crust (my recipe makes 2 crusts; you’ll just need 1)*
• 5 and 1/2 cups (about 780g) fresh blueberries*
• 1/2 cup (100g) granulated sugar
• 1/3 cup (41g) all-purpose flour
• 1 Tablespoon cornstarch
• 1 Tablespoon lemon juice
• 1 teaspoon lemon zest
• 1/2 cup (100g) packed light or dark brown sugar
• 6 Tablespoons (46g) all-purpose flour
• 1/2 teaspoon ground cinnamon
• 5 Tablespoons (71g) unsalted butter, very cold and cubed
• 1/2 cup (40g) old-fashioned whole rolled oats