"My mother comes from Bavaria where potatoes are used many different ways," says Hafner. "In fact, she has a very old Dr Oetker cookbook, which has 200 recipes devoted to the potato! Quite a few of those are desserts (Germans are pretty inventive when it comes to the humble potato). These potato dumplings rolled in buttery cinnamon breadcrumbs and stuffed with rhubarb compote are her recipe - she also uses Angelina plums in autumn, which are equally delicious. You really only need one for dessert, but any leftovers are delicious the next day cold."