This year has been a bumper one for plums, and the tree in the back garden has produced more than we can cope with. Plum jam is a real treat and a very easy recipe to make, as it usually sets very well.
Use slightly under ripe plums for making jam, as they have higher pectin levels, save the ripe ones for eating.
Removing the stones from plum (or damson) jam can be a pain if left until the end of the jam making process when it tends to cause a hot sticky mess everywhere. When making this batch of jam I roasted the plums before hand and squeezed out the stones, a process explained in more detail in this blog post.