Potato and Mascarpone Cheesecake Flan

Potato cheesecake is a great British dessert that always eats well, but I have decided to give it an Italian touch with the addition of mascarpone. I find this gives the pudding a richer and creamier finish, almost like a baked custard tart. I am using lemon zest in this recipe to lift all the other flavours, but orange zest can also be used.