Cut up the plums into halves if blended or into quarters if you want to keep the pieces whole
In a saucepan, combine the plums, sugar, and lemon juice. Mix well, and let sit for a couple of hours or overnight, to allow all the juices to come out
Cook over medium heat
If needed, take the foam off; it is optional, since the foam will reduce some over the cooking time
Keep cooking and stirring until the mixture thickens to your liking, 10- 20 minutes
To blend the jam, transfer it to a blender or use a hand blender and blend to your liking.
Ladle the jam into clean jars
Cover with lids and screw on bands finger tight
Process in a water bath or steam canner for 15 minutes
Recipe by Northern Homestead at https://northernhomestead.com/plum-jam-recipe/