Peel the clementines and carefully remove the white skin. Cut the clementines into slices. Put icing sugar and 3-4 tablespoons of water in a large pan and allow to caramelize. Remove pan from heat, add butter and melt while stirring. Immediately pour the caramel into a greased tart tin (24 cm Ø) and let it cool down. Place clementine slices next to each other on the caramel. Mix flour, sugar, salt and baking powder.
Add egg, quark, milk and oil and knead to a smooth dough with the dough hooks of the hand mixer. Roll out the dough on a floured work surface until round (approx. 26 cm Ø) and place on the clementine slices. Press down on the edge. Bake the tart in a preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for 20-25 minutes. Allow to cool briefly, then turn out onto a cake plate. Sprinkle with sugar crystals before serving. Serve lukewarm or cold
Waiting time approx. 45 minutes