Zwiebelkuchen

Zwiebelkuchen is a savoury tart of softened onion set in an egg-and-cream custard over a yeast or shortcrust base. It's Germany's onion cake, and it shows up on menus at a very specific time of year — autumn, alongside the season's cloudy, half-fermented young wine, the pairing the whole dish is really built around.

What it actually is

Large amounts of onion are softened slowly in fat until sweet and translucent but not browned, then spread over a yeast or shortcrust base along with diced bacon. An egg-and-cream custard, seasoned with caraway seeds and nutmeg, is poured over the top, and the whole tart is baked until the custard sets and the edges of the onion just catch a little colour.

The caraway isn't incidental — it's a defining flavour of the dish and part of what's meant to stand up to the sharp, slightly fizzy young wine it's traditionally served alongside.

How it's served

• Warm, cut into wedges, straight from the tray.
• With Federweißer — the season's cloudy young wine — as the classic autumn pairing.
• As a light meal, not usually a starter, given how rich the custard and bacon make it.

Writing it on a menu

• Flag gluten, egg and dairy; the base and custard carry all three.
• Mention the bacon, since a vegetarian version without it is a genuinely different, lighter dish worth naming separately if you offer both.
• Say if you serve it seasonally, alongside young wine, since that pairing is a real part of the dish's identity rather than an arbitrary suggestion.
• Note the caraway seed, since some guests have a strong opinion on it and it's a defining, not incidental, flavour.