Clean and wash the rhubarb and cut it into pieces about 2 cm wide. Weigh 500 g rhubarb. Mix rhubarb with nectar and jam sugar in a large pot. Bring to the boil while stirring over high heat and boil for about 3 minutes, remove from heat. Pour the rhubarb compote into a bowl and let it cool down
Mix the quark and 125 g compote. Mix the cream firmer with vanilla sugar. Whip the cream until very stiff, allow the cream firmer to trickle in. Fold the cream into the quark, chill for approx. 2 hours
Arrange the compote on 4 deep plates or bowls. Cut the mousse into large dumplings and place them on the compote. Sprinkle with pistachios and decorate with melissa. Serve dusted with icing sugar
waiting time approx. 3 hours