It's traditionally eaten alongside cloudy new wine, or 'Federweißer' — a pairing so fixed that autumn wine-festival menus barely bother listing them separately.
A yeasted or shortcrust base is topped with a custard of eggs, cream, and heaps of slow-cooked onion, often scattered with bacon or caraway, and baked until set. Wine-village Besen taverns and autumn street festivals sell it warm by the slice.