This is as simple as it gets and very tasty!
Good luck!
4lb Damsons
1/2pt Water
3lb Sugar
1 Package Sure-Jell Pectin
To Prepare Damson Jam
1. Wipe all the damsons, simmer them gently with the water until they are soft, and have made plenty of juice.
2. Stand by with a wooden spoon and catch up all the stones as they loosen and come to the top. It is always better to remove as many stones as possible before adding the sugar, because this prevents wasteage.
3. Pour in the sugar but retain about a cupfull (maybe a palm full) stir to dissolve it, then bring to the boil.
4. Mix the package of Sure-Jell (or what ever brand you have in U.K.) into the retained sugar and add to the fruit/sugar mix. Boil moderately fast until a little will set when tested, stirring constantly.
(A word about the testing; place a metal spoon in ice cold water and every so often, dip the spoon into the boiling mix and hold it edge up over a saucer or anything else to catch the drip. When ready to place in jars, the mixture on the spoon will form little ridges as it flows off the spoon. The action is called "sheeting" and means quite a bit will remain on the cold spoon. The pectin assures a good "set".)
4.Pour while very hot into sterile jars and seal immediately.
The sealing will be with the lids and rings that come with the jars. We like the smaller 1/2 pint, decorated jelly jars. Tighten the lids fairly tight and place into a waiting pot of boiling water with enough to cover the jars. Boil moderately for about 10 minutes. Remove from water and place on a cutting board that's been covered with a tea towel (the white ones used for drying dishes) in a cool, out of the way place until each one is cool to the touch. You should hear each one emit a "ping" when the vacuum seal is complete. Additionally, the top of the jar seal has a little "pimple" on it which will become concave when the "ping" happens. Store for winter use...
Best of luck!