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