Grated Cake with Blueberries and Quark

INSTRUCTIONS

• 1
  Whip the softened butter together with granulated sugar into a light and fluffy foam; this takes several minutes. Add the egg yolk and whisk until smooth. Now add the flour mixed with cinnamon, cardamom, and salt, and use a spatula or your hands to work it into a smooth and only slightly sticky dough. Wrap in cling film and place in the freezer to firm up for at least 2 hours.
• 2
  Once the dough is cold, preheat the oven to 180 °C and line a baking pan, approximately 20x20 cm, with baking paper. Prepare the filling. Mix the quark with the egg yolk, powdered sugar, starch, and scraped vanilla bean. In a separate bowl, whip the egg whites with a pinch of salt into very stiff peaks and carefully fold them into the quark mixture.
• 3
  Coarsely grate the frozen dough and sprinkle approximately 2/3 of it onto the bottom of the prepared pan. Then pour the quark filling over it, smooth it out, and sprinkle with blueberries. Finally, cover with the remaining grated dough.
• 4
  Place in the preheated oven and bake for approximately 50 minutes or until the top of the cake is golden brown. After baking, let it cool completely in the pan, then remove it with the paper and cut into pieces.