01 - Set oven to 350°F and prepare a 9-inch tart pan.
02 - In a mixing bowl, blend all-purpose flour, unsweetened cocoa powder, granulated sugar, and salt. Cut in the cold butter using a pastry cutter or food processor until the mixture forms coarse crumbs.
03 - Add egg yolk and 2 tablespoons cold water to the bowl. Stir until the dough forms, adding up to 1 extra tablespoon water if needed for cohesion.
04 - Shape dough into a disk, wrap in plastic, and refrigerate for 30 minutes.
05 - On a floured surface, roll dough to approximately 1/8-inch thickness to fit a 9-inch tart pan. Transfer and press dough into the pan, trimming any excess. Prick the base lightly 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 for an additional 10 to 12 minutes until the crust is set. Cool completely in the pan.
07 - Heat heavy cream in a saucepan until just below boiling. Pour over chopped dark chocolate in a bowl and let sit for 1 minute. Add butter, then stir gently until ganache is smooth and glossy.
08 - Pour ganache into cooled tart shell and smooth the top evenly. Refrigerate for at least 1 hour to set.
09 - Evenly lay halved strawberries over the set ganache in a decorative pattern.
10 - Warm apricot jam and brush lightly over the strawberries for a shiny finish.
11 - Cut into slices and serve chilled or at room temperature.