Mix the quark with the sugar. Whip the cream with vanilla sugar until stiff and fold into the quark. Fold in 70 g mini marshmallows.
Drain the peaches in a sieve, dice them and mix with the cream. Alternatively, you can puree the fruit and pull it under the cream with a slightly marbled pattern.
Let it steep in the refrigerator for 2 hours. Garnish with the remaining marshmallows before serving.
Tip: You can also cut normal marshmallows into small pieces and use them for the cream.