01 - Preheat the oven to 350°F.
02 - Combine flour, cocoa powder, sugar, and salt in a mixing bowl. Cut in the cold butter until the mixture resembles coarse crumbs.
03 - Add the egg yolk and 2 tablespoons cold water. Mix until the dough forms, adding more water a teaspoon at a time if needed.
04 - Shape the dough into a disk, wrap in plastic, and refrigerate for 30 minutes.
05 - On a lightly floured surface, roll dough to fit a 9-inch tart pan. Press into the tart pan, trim edges, and prick the base with a fork.
06 - Line dough with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes. Remove weights and parchment, then bake an additional 10 to 12 minutes until the shell is firm. Allow to cool completely.
07 - Heat heavy cream in a saucepan until just below boiling. Pour over chopped chocolate in a bowl, let stand for 1 minute, then add butter and stir until smooth and glossy.
08 - Pour ganache into the cooled tart shell. Smooth the surface. Refrigerate for at least 1 hour until set.
09 - Neatly arrange halved strawberries over the set ganache.
10 - If desired, warm apricot jam and brush it gently over the strawberries for added sheen.
11 - Cut into slices and serve chilled or at room temperature.