01 - Preheat the oven to 350°F.
02 - In a mixing bowl, combine all-purpose flour, unsweetened cocoa powder, granulated sugar, and a pinch of salt. Cut in cold butter using a pastry cutter or food processor until mixture resembles coarse crumbs.
03 - Add the egg yolk and 2 tablespoons cold water. Mix just until the dough comes together, adding a bit more water if needed.
04 - Shape the dough into a disk, wrap tightly in plastic wrap, and refrigerate for 30 minutes.
05 - On a lightly floured surface, roll the dough to fit a 9-inch tart pan. Press dough into the pan, trim edges, and prick the base with a fork.
06 - Line the crust with parchment paper and fill with baking weights or dried beans. Bake for 15 minutes. Remove weights and parchment, then bake an additional 10 to 12 minutes until firm. Allow to cool completely.
07 - In a small saucepan, heat heavy cream until just below boiling. Pour over chopped dark chocolate in a heatproof bowl and let sit for 1 minute. Add unsalted butter and stir until the ganache is completely smooth and glossy.
08 - Pour the ganache into the cooled tart shell. Smooth the surface and refrigerate for at least 1 hour to set.
09 - Neatly arrange the halved strawberries over the set ganache.
10 - If desired, warm apricot jam and brush lightly over the strawberries to create a glossy finish.
11 - Slice and serve chilled or at room temperature.