The German Onion Tart, known in Germany as Zwiebelkuchen, is a beloved savory specialty from the southern regions. Traditionally enjoyed in autumn, this tart is often paired with the season’s first wines — called “Süsser” or “Suser” in many areas, and “Federweisser” in parts of the Rhineland. In and around Freiburg and the Black Forest’s Kaiserstuhl region, a slice of warm Zwiebelkuchen and a glass of new wine are commonly served in small seasonal country inns called Besenwirtschaften. These simple wine taverns open for a limited time in the fall, offering house-made wines and rustic appetizers, with the onion tart being a classic favorite.
The dish is closely related to Alsace’s Flammkuchen (also called Speckkuchen), just across the French border. Flammkuchen usually features a thinner, crispier crust and is often topped with smoked bacon and a generous layer of heavy cream. Both tarts celebrate simple, high-quality ingredients: onions, cream, bread- or yeast-based dough, and smoked pork. Below is a clear, user-friendly recipe for German Onion Tart that keeps the traditional flavors intact.
See the Flammkuchen recipe for a thin-crust alternative (no external link provided)
Ingredients German Onion Tart
Yeast Dough (Hefeteig)
250 g flour
20 g fresh yeast (or about half a packet of dry yeast)
1 dash sugar
1/8 l warm milk
1 egg
50 g soft butter
1 dash salt
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Topping
1 kg onions
5 tbsp neutral-tasting oil (sunflower or canola)
50 g smoked bacon (German Speck), diced
200 g sour cream
Caraway seeds to taste
Sweet paprika powder and freshly ground black pepper to taste
Baking Instructions German Onion Tart
1. Prepare the dough: Sift the flour into a bowl and make a well in the center. Crumble the fresh yeast into the well (or add the dry yeast), sprinkle a little sugar over it, then pour in the warm milk. Mix briefly to dissolve the yeast and form a loose starter. Cover with a kitchen cloth and leave in a warm place for about 30 minutes until it becomes foamy.
2. Finish the dough: Add the egg, softened butter and a pinch of salt to the bowl. Knead thoroughly until you have a smooth, elastic dough. Shape into a ball, cover again and let it rest for another 30 minutes so it can rise and become slightly puffy.
3. Prepare the onions: While the dough rests, peel the onions and slice them very thinly (preferably with a sharp knife or mandoline for even slices).
4. Cook onion-bacon mixture: Heat the oil in a large skillet over low heat. Gently sauté the onion slices slowly so they become translucent and soft without browning too much. Add the diced bacon and cook for a couple of minutes until the bacon releases its flavor. Remove from heat and allow the mixture to cool slightly.
5. Combine topping: Stir the sour cream into the slightly cooled onion-and-bacon mixture. Season with caraway seeds, sweet paprika and freshly ground pepper. Taste and adjust seasoning as needed; the mixture should be savory and aromatic.
6. Shape the tart base: Lightly flour a work surface and roll the dough out to fit your baking tray or a rectangular sheet pan. Transfer the dough to a greased tray or one lined with parchment paper, pressing gently to spread it evenly. Prick the surface several times with a fork to prevent large air pockets, then allow the dough to rest and rise briefly for about 30 minutes.
7. Bake: Spread the onion-and-sour-cream mixture evenly over the risen dough. Preheat the oven to 200 °C (about 400–425 °F) and bake the tart for approximately 40–45 minutes, until the crust is golden and the topping is set. Oven temperatures vary, so watch the tart in the final minutes to avoid over-browning.
Serve the Zwiebelkuchen warm or at room temperature. It pairs beautifully with a chilled white wine or, for the authentic seasonal experience, a glass of new wine (Suser or Federweisser). Enjoy a rustic slice with friends and family as part of an autumn gathering or a cozy evening.