Drain the apricots and collect the juice. Cut the apricots into slices. Stir mascarpone, quark, 4 tablespoons apricot juice and rum until smooth. Stir in sugar, lemon juice and vanilla flavouring.
Finely chop the chocolate. Fold half into the cream. Arrange apricots and cream on dessert plates. Sprinkle with the remaining chopped chocolate. Serve garnished with mint.