Crumble the lady fingers, sprinkle with liqueur and let them steep for about 20 minutes. Wash, clean and halve the strawberries and sprinkle with 25 g sugar. Mix quark, mascarpone, vanillin sugar, remaining sugar and cream with the whisks of the hand mixer.
Layer soaked lady fingers, strawberry halves, up to 10 pieces to decorate, and curd mascarpone cream in a mould. Mix icing sugar and cocoa and sieve onto the Tirami-Su. Serve decorated with remaining strawberries and lemon balm.