01 - Preheat oven to 350°F.
02 - Combine flour, cocoa powder, granulated sugar, and salt in a mixing bowl.
03 - Add cold, cubed butter to the dry mixture and cut it in with a pastry cutter or food processor until the mixture resembles coarse crumbs.
04 - Mix in the egg yolk and 2 tablespoons cold water. Stir until the dough begins to come together, adding an additional tablespoon of water if necessary.
05 - Form dough into a disk, wrap tightly in plastic wrap, and refrigerate for 30 minutes.
06 - On a lightly floured surface, roll the chilled dough to fit a 9-inch tart pan. Gently press into the pan, trim excess, and prick the base with a fork.
07 - Line the crust with parchment paper, fill with baking weights or dried beans, and bake for 15 minutes. Remove weights and parchment, then bake for an additional 10–12 minutes until the crust is firm. Allow to cool completely in the pan.
08 - Heat heavy cream in a small saucepan just below boiling. Pour over chopped dark chocolate in a bowl, let stand 1 minute, then add butter. Stir until ganache is smooth and glossy.
09 - Pour ganache into the cooled tart shell, smoothing the top. Chill in the refrigerator for at least 1 hour to set.
10 - Decoratively arrange halved fresh strawberries over the set ganache.
11 - If desired, gently warm apricot jam and brush over strawberries using a pastry brush for a glossy finish.
12 - Slice the tart and serve chilled or at room temperature.