Wash the currants, drain and carefully remove from the panicles. Whip the cream until stiff. Mix quark, sugar and liqueur. Fold in the cream and currants, except some for sprinkling.
Amarettini, up to 8 pieces to decorate, coarsely crumble. Dip four dessert glasses first with the rim in lemon juice, then in the Amarettini crumbs. Fill the glasses with the quark. Sprinkle with remaining crumbs and currants and decorate with amarettini and lemon balm.