3: Preheat the oven to 360°F (180°C). Take the pastry case out of the fridge and trim off the overhanging pastry around the edge.
4: Pour the custard filling into the pastry case...
5: ...and bake for about 50 minutes.
6: Leave to cool before slipping off the ring. You can eat this right away, but it will be even better next day if left overnight in the fridge first.
Remarks
You can make this with milk chocolate instead of dark, if you prefer. Fancy even more chocolate? Use chocolate sweetcrust pastry instead of the usual plain.