Preheat the oven to 350°F (180°C). Grease and flour a Bundt pan.
Mash the quark cheese with a fork, then add the grated lemon zest and honey.
Separate the eggs. In a clean bowl, whisk the egg whites with a pinch of salt until stiff peaks form.
In a separate bowl, cream the egg yolks with the granulated sugar and vanilla sugar until pale and fluffy. Add the melted butter and milk, and mix well.
In another bowl, combine the flour and baking powder. Gradually add the dry ingredients to the egg yolk mixture, mixing until just combined.
Add the quark and honey mixture to the batter, then gently fold in the beaten egg whites, being careful not to deflate the batter.
Pour the batter evenly into the prepared Bundt pan.
Bake in the preheated oven for approximately 40-45 minutes, or until golden brown. Check for doneness with a toothpick – it should come out clean.
Remove from the oven and let cool in the pan for a few minutes before inverting it onto a wire rack to cool completely. Dust with powdered sugar before slicing and serving.
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