Step 1: For the crust, pulse together the flour, cocoa powder, sugar, and salt in a food processor until just combined.
Step 2: Add the cold, cubed butter and pulse a few times until the mixture looks like coarse crumbs with some pea-sized butter pieces.
Step 3: Add 3 tablespoons of ice cold water and pulse. If the dough is still dry, add more water, 1 tablespoon at a time (up to 5 total), pulsing until it just starts to come together when pinched.
Step 4: Turn the dough out onto a clean surface, gently bring it together, form into a 1-inch thick disk, wrap tightly in plastic wrap, and refrigerate for at least 30 minutes.
Step 5: When ready to bake, preheat your oven to 375°F (190°C).
Step 6: Lightly flour your rolling surface and the top of the dough disk. Roll the dough out into a circle about 12 inches in diameter. Carefully transfer the dough to a 9-inch pie plate. Gently press it into the plate and up the sides. Trim off any excess dough and crimp or flute the edges.
Step 7: Using a fork, gently prick the bottom and sides of the crust all over (docking).
Step 8: Line the inside of the raw crust with parchment paper and fill it with pie weights, dried beans, or rice. Bake for 15 minutes.
Step 9: Carefully remove the parchment and weights. Bake for another 10-12 minutes, or until the crust looks firm and matte. Let it cool completely on a wire rack.
Step 10: For the ganache, put your chopped semi-sweet chocolate in a heatproof bowl.
Step 11: Pour the heavy cream into a small saucepan and heat it over medium heat until it just barely starts simmering around the edges (do not boil rapidly).
Step 12: Pour the hot cream directly over the chopped chocolate in the bowl. Let it sit for 5 minutes without touching it.
Step 13: After 5 minutes, whisk the mixture gently from the center outwards until it comes together into a beautiful, smooth, and glossy chocolate filling.
Step 14: Pour the ganache into your cooled pie crust. Spread it out evenly with a spatula.
Step 15: Pop the pie into the refrigerator for at least 1 hour to set up and become firm.
Step 16: For the strawberry topping, in a medium saucepan, combine about 1/4 of the hulled and halved strawberries with the sugar, cornstarch, water, and lemon juice.
Step 17: Place the saucepan over medium heat. Stir constantly and use a spoon or potato masher to gently mash the strawberries as they cook. Keep cooking and stirring until the mixture thickens into a lovely, jam-like sauce (about 5-7 minutes).
Step 18: Remove the saucepan from the heat. Add the remaining fresh, un-cooked strawberry halves into the hot sauce. Stir gently to coat them.
Step 19: Let the strawberry topping cool slightly (it doesn't need to be cold, just not piping hot).
Step 20: Once the ganache layer in the pie crust is set, carefully pour the strawberry topping over the top. Spread it out evenly over the chocolate layer.
Step 21: Put the entire pie back in the refrigerator for at least 4 hours (or ideally longer, like overnight) so everything can chill and set up beautifully.
Step 22: Once it's fully chilled, slice yourself a generous piece and enjoy!