Wash the medlars, dab dry, cut in half and remove the seeds. Break the lychees out of their shells, halve them and remove the seeds. Put sugar in a wide pot and caramelise while stirring until golden brown.
Deglaze with 1/8 litre hot water. Add lemon juice and simmer for one minute while stirring. Toss medlars and lychees in it and spread it on dessert plates. Tear open Cape gooseberries in a star shape and place one fruit on each plate.
Serve garnished with mint leaves.