Wash and clean the strawberries and, except for 3 berries for decoration, cut them into pieces. Mix curd and sugar. Whip the cream until stiff, adding cream firming agent and vanillin sugar.
Fold the cream under the quark. Place 1 wafer on a cake plate. Spread half of the quark cream on top and sprinkle with half of the strawberries. 2. place the wafer, the rest of the quark cream and the strawberries on top.
Cover with the third wafer. Cut the remaining strawberries in half, place on top. Mix icing sugar and lemon juice. Pour into a piping bag, cut off a small tip and draw the icing in strips over the wafer cake.
Decorate with mint. Serve the wafer cake immediately, as the wafers soften quickly.