01 - Set oven temperature to 350°F.
02 - Combine all-purpose flour, unsweetened cocoa powder, granulated sugar, and pinch of salt in a mixing bowl.
03 - Cut in cold, cubed unsalted butter with a pastry cutter or food processor until the mixture forms coarse crumbs.
04 - Blend in egg yolk and 2 tablespoons cold water, mixing until dough begins to come together. Add an additional tablespoon of water if required.
05 - Shape dough into a disk, wrap tightly with plastic, and refrigerate for 30 minutes.
06 - On a lightly floured surface, roll dough to fit a 9-inch tart pan. Gently press into the pan, trim excess, and prick base with a fork.
07 - Line the prepared tart shell with parchment paper and fill with baking weights or dried beans. Bake for 15 minutes; remove parchment and weights, then continue baking for 10 to 12 minutes until crust is set. Let cool fully.
08 - In a saucepan, heat heavy cream just below boiling point. Pour hot cream over finely chopped dark chocolate in a bowl, let stand 1 minute. Add butter, then stir until smooth and glossy.
09 - Pour ganache into the cooled tart shell. Smooth the surface and chill in the refrigerator for at least 1 hour until set.
10 - Decorate the set ganache with halved strawberries, arranging them evenly over the surface.
11 - Warm apricot jam and use a pastry brush to gently glaze the strawberries for a shiny finish.
12 - Cut tart into portions and serve chilled or at room temperature.