01 -
Place flour, cocoa powder, caster sugar, and salt into a food processor or mixing bowl and combine evenly.
02 -
Add cold cubed butter to dry ingredients and blend or rub in until the mixture resembles coarse, sandy crumbs.
03 -
Pour in cold milk and mix just until the dough comes together. Shape into a disc, wrap tightly in cling film, and refrigerate for a minimum of 3 hours.
04 -
On a lightly floured surface, roll the chilled pastry to a 3 mm thickness. Line a 25 cm tart tin, trimming the edges, and dock the base with a fork. Refrigerate for another 30 minutes.
05 -
Preheat oven to 170°C (fan) or 190°C (conventional). Line pastry with baking paper and fill with baking weights. Bake for 20 minutes, then remove weights and bake for an additional 15 minutes until firm. Cool completely.
06 -
Heat caster sugar in a saucepan over medium-low heat, swirling as it melts and turns amber. Add butter, then gradually whisk in warm cream, vanilla, and salt. Continue whisking until smooth.
07 -
Allow caramel to cool slightly, then pour into the cooled tart shell. Refrigerate until set and firm.
08 -
Warm the double cream in a saucepan until steaming but not boiling. Pour over chopped dark chocolate in a heatproof bowl. Allow to stand 1 minute, then whisk gently until completely smooth.
09 -
Pour chocolate ganache evenly over the set caramel layer. Gently tap to smooth the surface, then chill until ganache is fully set.
10 -
Before serving, lightly dust with cocoa powder and sprinkle generously with flaky sea salt to enhance flavour and presentation.