01 - Set oven temperature to 350°F.
02 - In a mixing bowl, blend all-purpose flour, cocoa powder, granulated sugar, and salt.
03 - Work cold, cubed butter into the dry mixture using a pastry cutter or fingertips until crumbly.
04 - Incorporate the egg yolk and 2 tablespoons cold water, mixing until dough forms. Add additional water if needed to bring the dough together.
05 - Shape the dough into a disk, wrap in plastic, and refrigerate for 30 minutes.
06 - On a lightly floured surface, roll dough to fit a 9-inch tart pan. Press into pan, trim edges, and prick the base with a fork.
07 - Line crust with parchment paper, fill with baking weights or dried beans, and bake for 15 minutes. Remove weights and parchment; continue baking 10–12 minutes until firm. Cool completely.
08 - In a saucepan, heat heavy cream until just below boiling. Pour over chopped dark chocolate in a bowl, let sit 1 minute, then add butter and stir until smooth and glossy.
09 - Pour ganache into cooled tart shell and smooth the surface. Refrigerate at least 1 hour to set.
10 - Distribute halved strawberries over set ganache layer.
11 - Warm apricot jam and brush over strawberries for a glossy finish.
12 - Slice and serve chilled or at room temperature.