Berliners call it 'Pfannkuchen' — the word the rest of Germany uses for pancakes — so ordering a 'pancake' in a Berlin bakery gets you a doughnut.
A yeasted dough ball is deep-fried in fat rather than baked, split and piped full of jam (classically plum or rosehip), then dusted with sugar or glazed. Bakeries and street stalls sell them year-round, with a spike around New Year's and Carnival season.