Wash the greengages, dry them, cut them in half lengthwise, stone them and dice them roughly. Mix the venison, lime juice and gelling sugar. Bring to the boil and boil for 3 minutes while stirring until bubbly. Add rum and stir in. Bring to the boil again. Fill up to the brim into 4 clean twist-off glasses, close them and put them on the lid for about 5 minutes. Jam has a shelf life of approx. 2 years