Zwiebelkuchen

Germany's autumn onion tart: a yeasted bread base topped with slow-caramelised onions, smoked bacon, and caraway cream: the defining harvest dish of Baden-Württemberg, eaten with new wine as the year turns

Origin: Germany

From the journey of Onion.

Zwiebelkuchen (literally 'onion cake' in German) is the defining seasonal dish of Baden-Württemberg in southwest Germany and the adjacent Alsace region of France; where it appears as tarte à l'oignon or flammkuchen. It is an autumn dish, baked in September and October when the new wine (Federweißer, partially fermented grape juice) is produced and sold at roadside stands. The traditional pairing of zwiebelkuchen and Federweißer is one of the great regional seasonal eating moments in European food culture. The tart consists of a yeasted bread dough base (denser and more substantial than shortcrust pastry) topped with an enormous quantity of slow-caramelised onions, cooked down to a sweet, golden collapse, mixed with smoked bacon (Speck), caraway seeds, eggs, and sour cream (Schmand). The caraway is essential: its anise-like warmth cuts through the richness of the cream and egg and provides the distinctly Germanic flavour that separates zwiebelkuchen from all French and Italian onion tart traditions.

Ingredients

Topping

  • 1 kg onions, thinly sliced into rings
  • 200 g smoked bacon (Speck or lardons), diced
  • 200 g Schmand or sour cream (or crème fraîche)
  • 3 large eggs, beaten

Spices

  • 1.5 tsp caraway seeds

Seasoning

  • 0.5 tsp salt
  • 0.5 tsp black pepper

Fat

  • 2 tbsp neutral oil or lard (for the onions)

Dough

  • 300 g plain flour
  • 7 g instant dried yeast (1 sachet)
  • 1 tsp salt
  • 1 tsp sugar
  • 180 ml warm water
  • 3 tbsp neutral oil (for the dough)

Method

  1. Make the dough: combine the flour, yeast, salt, and sugar. Add the warm water and oil. Knead for 8 minutes until smooth and elastic. Cover and leave to rise in a warm place for 1 hour until doubled.
  2. While the dough rises, fry the bacon in a dry pan until the fat renders. Remove the bacon, leaving the fat. Add the oil and onions to the same pan. Cook over medium-low heat for 30–35 minutes, stirring regularly, until deeply golden and sweet.
  3. Add the caraway seeds to the onions in the last 5 minutes of cooking. Stir to combine. Allow to cool to room temperature.
  4. Whisk together the Schmand (sour cream), eggs, salt, and pepper. Stir in the cooled onion mixture and bacon.
  5. Preheat the oven to 200°C (fan 180°C / 390°F). Roll the risen dough to fit a 30x40cm baking tin or form a round on a baking sheet. Press into the tin. Pour the onion filling over and spread evenly.
  6. Bake for 30–35 minutes until the topping is set, golden-brown, and slightly puffed, and the dough edges are golden. Rest for 5 minutes before cutting. Serve warm.

Notes

The Alsatian version of this dish, tarte flambée (or flammekueche in Alsatian dialect), uses a thinner, crispier dough similar to pizza dough, topped with crème fraîche, onions, and lardons without the egg mixture. The German zwiebelkuchen is substantially richer and thicker. Both are correct regional expressions of the same autumn-harvest onion celebration. Baden-Württemberg's onion production is significant: the Rottenburg area near Tübingen produces the Swabian Bottwarer Zwiebel, a prized heritage variety with a particularly sweet, mild flavour preferred for zwiebelkuchen.

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