Add quark and egg yolks to a large bowl and mix until well combined.

Blend in the soft butter.

Add sugar, vanilla sugar and strawberry extract and salt and mix briefly to combine.

Sieve flour and baking powder to the bowl and knead until everything is well combined. Make sure to don´t over knead the dough.

Wrap dough into plastic wrap and refrigerate for 1-2 hours.

Preheat oven to 350 F.

Roll dough out to about ⅛-inch.

Cut out circles using a cookie cutter or a glass with about 2 to 3-inch diameter.

Brush each circle with a thin layer of jam. (optional)

Place 5 circles overlapping in a row and then roll up to a rose.

Cut each rolled up rose through the middle into two pieces.

Carefully pull out each leave to open the rose.

Place the roses on a with parchment paper lined baking sheet and bake for 30-35 min. until golden brown.

Allow to cool completely on a cooling rack.

Sprinkle with powdered sugar. (optional)