Enjoy your plum jelly at your leisure. On a simple slice of toast with a bit of decent butter, it's a real treat.
Remarks
Of course, if you leave the skins in, this will give you a normal plum jam – which is great, too. In this case, I recommend cutting the plums in half or into quarters as this makes the jam easier to spread.
All types of plums (Victoria, damsons, mirabelles, greengages...) are suitable for this recipe.