Sieve the flour and cacao powder with a pinch of salt. Whisk the butter and sugar in a bowl. Mix this with the egg and chocolate.
Add the flour mixture and knead this into a dough. Add a little extra flour if needed for a better dough.
Leave to rest for 30 minutes
Roll out the dough and put into your baking tin (round 25 cm. low edge) and put the tin back into the fridge for about 15 mins.
Preheat your oven in the meantime to 210 C.
Blindbake your pastry for about 15 mins. Then take out and remove the baking beans and bake for another 5 minutes. Leave to cool.
Decrease the temperature of your oven to 170 C.
Brush about 1/3 of the melted chocolate over the bottom of the crust. Bring the milk and creamt to the boil and mix this with the rest of the chocolate.
Whisk the eggs, sugar and vanilla in another bowl and mix this together with your chocolate cream. Pour the mixture into the doughtin and bake for 40-45 minutes at 170 C.
Once done, dust with a sprinkling of cacao powder (optional)