Make a puree from fresh red, ripe Cornelian cherries and peel and core the nectarines and then cut them into very thin slices. Also peel and core the Grafensteiner and cut into thin slices.
Then put everything in a saucepan and sprinkle with the preserving sugar and leave to work a little. Then cook the jam for 4 minutes as instructed, place in prepared, hot twist-off jars and close.