German onion cake is a traditional preparation that originated in the Alsace region, an area that has historically exchanged culinary traditions between Germany and France. This dish is known in Germany as "Zwiebelkuchen" and has become popular in different Latin American countries, where it goes by similar or adapted names, such as "onion tart" or "onion pie." In Chile and Argentina, for example, it is common to find variants with local additions, but the base always includes a crispy crust and a generous filling of caramelized onions. This cake is ideal to accompany coffee or as an appetizer at family gatherings, and it stands out for its intense flavor and the smooth texture provided by its mixture of cream and egg.
How to Prepare German Onion Cake
In a medium skillet, sauté the onions in butter over low heat until they begin to brown, approximately 15 minutes.
Season with 1/4 teaspoon of salt, marjoram, and pepper.
Set aside to cool.
Preheat the oven to 230°C (450°F).
In the bowl of a food processor, place the flour, cornstarch, baking powder, and the remaining salt.
Mix.
Add the butter and process until it has the texture of fine crumbs.
Add the milk and quickly mix to form a smooth dough.
Grease a 25 cm round pan and distribute the dough evenly with your fingers.
Spread the cooked onions over the dough.
Beat the egg and sour cream together.
Pour the mixture over the onion and spread it to the edges of the pan.
Lightly sprinkle with poppy seeds and paprika.
Bake for 20 minutes.
Let it cool slightly and then cut into portions.