Wash and drain the plums. Halve the fruits, stone them and cut them into slices. Weigh 900 g fruit
Mix fruit sugar, except for 2 tablespoons, plums, cherry juice and spices well in a pot. Cover and leave to stand for approx. 24 hours
Then mix the gelling agent and the remaining sugar, stir into the fruit mass
Bring everything to a boil over a high heat while stirring constantly. Then let it boil fizzily for 2 minutes (or see package instructions)
Pour the jam into well-cleaned twist-off jars, close tightly. Leave to cool upside down. Store in a cool and dark place