Wash mint, shake dry, pluck leaves from the stalks. Crush mint leaves and 25 g sugar in a mortar. Wash the lime thoroughly, grate dry and grate the peel.
Squeeze the juice. Mix quark, sour cream, lime juice and zest, liqueur, vanillin sugar and 50 g sugar. Pour cream, except for 4 teaspoons, into 4 dessert glasses and spread cookies in them. Sprinkle with mint sugar.
Add 1 teaspoon of cream to each. Decorate with mint.