🇩🇪 Germany · Food
Zwiebelkuchen (German Onion Tart)
By eatmundo · July 6, 2026
Zwiebelkuchen, a savory German onion tart, is a comforting autumn classic traditionally enjoyed with 'Federweißer' (new wine). It features a rich yeast dough base topped with a generous layer of slowly cooked, tender onions, smoked bacon, and a creamy egg custard, baked until golden brown and irresistibly fragrant.
Ingredients
check them off as you prepareHow to Make It
- 1
Prepare Yeast Dough: In a large bowl, dissolve 7g active dry yeast (or 20g fresh yeast) and 1 teaspoon sugar in 150ml lukewarm milk. Let it sit for 5-10 minutes until foamy. Add 250g all-purpose flour, 50g melted butter, and 0.5 teaspoon salt. Knead for about 5-7 minutes until a smooth, elastic dough forms. Cover and let rise in a warm place for 45-60 minutes, until doubled in size, which indicates good yeast activity.
- 2
Prepare Onion Filling Base: While the dough rises, slice 1 kg onions thinly. In a large skillet (at least 28cm diameter), cook 150g diced smoked bacon (or lardons) over medium heat until crispy, about 7-10 minutes. Remove the bacon with a slotted spoon and set aside, leaving the rendered fat in the pan.
- 3
Sauté Onions: Add the sliced onions to the skillet with the bacon fat. Sauté over medium-low heat for 15-20 minutes, stirring occasionally, until they are very soft and translucent, but not browned. This slow cooking brings out their natural sweetness.
- 4
Prepare Custard Topping: In a medium bowl, whisk together 200g sour cream (or crème fraîche), 2 large eggs, 0.5 teaspoon salt, a good pinch of black pepper, and a touch of nutmeg. If using, stir in 1 teaspoon caraway seeds for an authentic touch.
- 5
Assemble Cake: Preheat oven to 200°C (390°F). Roll out the risen dough on a lightly floured surface into a large circle (approx. 30cm diameter). Transfer the dough to a greased 28-30cm springform pan or a baking sheet lined with parchment paper, forming a slight edge around the sides.
- 6
Add Topping & Bake: Spread the sautéed onions evenly over the dough base. Pour the sour cream and egg custard evenly over the onions. Sprinkle the reserved crispy bacon pieces (and more caraway seeds if desired) on top.
- 7
Bake in the preheated oven for 35-45 minutes, or until the crust is golden brown and the filling is set and lightly browned. A knife inserted into the center should come out clean. Let it rest for 10 minutes before slicing and serving warm, traditionally with new wine (Federweißer).
Frequently Asked Questions
What's the best way to prepare the onions for Zwiebelkuchen to ensure the best flavor and texture?+
Slowly sauté the onions until they are very soft and translucent, almost caramelized, to bring out their sweetness and reduce excess moisture before adding them to the tart.
What are the key steps to ensure the yeast dough for the Zwiebelkuchen rises properly?+
Ensure your active dry yeast is fresh and dissolved in lukewarm (not hot) milk. Let the dough rise in a warm, draft-free spot until doubled in size, which typically takes about an hour.
How can I prevent the Zwiebelkuchen from having a watery filling or a soggy bottom crust?+
Fully cook down the onions to release their moisture before mixing them into the filling. Additionally, blind baking the crust for a few minutes can help prevent a soggy bottom.
How do I know when my Zwiebelkuchen is perfectly baked, and what temperature should I aim for?+
Bake at around 190°C (375°F) for 35-45 minutes, or until the filling is set and golden brown, and the crust is cooked through and nicely browned.
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