Chop them into halves or smaller pieces if you like
Take a heavy-bottomed saucepan and add the plums to it
Add sugar and turn on the heat.
Give it a stir and let the sugar melt. Keep it covered while the sugar is melting.
Once the sugar melts, uncover and give it a stir.
The plums will release a lot of water/ juice and it will cook in its own juice.
You can now keep the temperature high and let it boil. Every now and then, give it a stir.
Once the plums have softened, they will dissolve and thicken. The skin remains, which is fine and it helps in spreading the jam well. Gives it a nice texture.
When it has become syrupy, take a spoon and pick some jam and pour on a cold plate.
Pop the plate in the refrigerator for 2 minutes. Take it out and run your finger in the center to see if there is a clear line and it feels like jelly. That is your indication that the jam is ready.
Take it off the heat and let it cool down. As it cools down, it thickens further. Once cooled, store in glass containers.
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