1. In a large bowl, whisk together flour, black cocoa powder, charcoal, and a pinch of salt.

2. Cut butter into the dry ingredients until the mixture resembles coarse crumbs.

3. Gradually sprinkle ice water, stirring until dough just comes together; form into a disk, wrap, and chill for 15 minutes.

4. Preheat oven to 375°F (190°C).

5. Roll out half the dough and line a 9-inch pie pan, trimming excess. Roll remaining dough and cut into shapes (bats, spider webs) for the top.

6. In a bowl, toss blackberries with sugar, cornstarch, and lemon zest until well coated.

7. Pour filling into the crust, arrange cutouts on top, and crimp edges.

8. Bake 40–45 minutes until filling bubbles and crust is firm.

9. Cool on a wire rack before slicing and serving.