Wash and clean the strawberries and cut them into small pieces. Mix with 30 g icing sugar and vinegar and chill for about 1 hour.
Stir mascarpone, quark, 30 g icing sugar, vanilla sugar and mineral water with the whisks of the mixer until very smooth.
Line the bottom of a small square mould (approx. 16 x 16 cm) with a layer of ladyfingers. Set aside 2 tablespoons of strawberries, covered. Spread half of the remaining strawberries and half the strawberry stock on the lady fingers.
Spread half of the cream over it. Layer another layer with the remaining lady fingers, strawberries, stock and cream. Cover the Tiramisu and chill for at least 4 hours.
Decorate the tiramisu with the separately chilled strawberries.