Drain cherries and apricots well on two sieves. Collect the apricot juice. Cut the apricots into slices. Mix lemon and apricot juice. Mix 5 tablespoons of juice with cornstarch.
Bring the rest of the juice, vanilla sugar and sugar to the boil, stir in the cornstarch, bring to the boil again and cool in a cool place for about 15 minutes. In the meantime, whip the cream until stiff. Stir lemon-apricot jelly again vigorously, stir in yoghurt and fold in the cream. Layer the cherries, apricots and lemon cream in 10 portion glasses and serve as desired, decorated with lemon balm, quartered lemon slices and cherries