In a big pot, put the pitted plums. Add the sugar and the lemon juice, and stir.
Put on high heat and bring to a boil.
Once it has boiled, put on low heat, and let simmer during 30 minutes.
After this time, take a little spoon of jam, and put it on a cold plate. If it gets jelly like, your jam is ready! If not, leave to cook 10 minutes more.
Pour in a jar, close it and turn it over. Leave that way until it gets cold.
There you are, your homemade plum jam is ready!
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