If you take low-fat quark, you should whip it up with a little mineral water; this is not necessary with quark with 20% fat.
Whip the cream with the sugar and vanilla sugar until stiff and fold into the quark. With that the cream is ready.
Puree the frozen fruits and strain them through a sieve. Such a sauce is always finer without seeds.
Put the cantuccini in a freezer bag and chop with a rolling pin or something similar, but not too fine, it can still crack a little. Wash the fresh berries.
Then put layer by layer in a bowl, drizzle cream - some sauce - cantuccini - berries, etc.
Tip: It looks best when you arrange it in a glass bowl and you can see the layers from the outside.