Place the quark, vanilla sugar, mascarpone, sugar, sour cream and almond liqueur in a bowl and mix with the whisks of the hand mixer until smooth. Line a mould (16x29 cm, 3.5 cm deep) with ladyfingers and sprinkle with strawberry liqueur.
Spread the cream evenly over the top and chill for about 30 minutes. In the meantime wash, clean and halve the strawberries. Dust the cream with cocoa, cover with strawberries and decorate as desired with mint leaves and quartered lemon slices.