Best Homemade Blackberry Pie

Preheat the oven to 375 degrees F (190 degrees C).

Smash blackberries in a bowl until they are mostly liquid, with only few chunks remaining.

Combine sugar, water, cornstarch, and lemon juice in a saucepan. Whisk out lumps and turn heat to high. Bring to a boil and stir; continue to cook for 3 minutes. Remove from heat. Add blackberries and mix together; set aside.

Combine flour, brown sugar, salt, and cinnamon in another bowl. Add butter and mix with your hands until clumpy and crumbly.

Press pie pastry into a pie pan and add blackberry filling; top with crumble.

Bake in the preheated oven until the bottom of the crust is cooked and golden, 40 to 50 minutes. Remove from the oven and let cool for filling to set, about 1 hour.