Help! plum jam on the stove

kirsty_rabbit, Dec 30, 9:27am
It doesnt seem to be setting!

I am testing it and then re boiling but it doesnt seem to be getting to the set stage and its been boiling for 20mins!
HELP

rainrain1, Dec 30, 6:06pm
Whoops too late!How was it!

lythande1, Dec 30, 6:14pm
20 mins isn't long.

cgvl, Dec 30, 6:54pm
You need to keep it at a rolling boil not a simmer for at least 20mins and the juice of a lemon also to help set. Depending on how ripe your plums were it could take 30-40mins before it will set. Also remember that homemade jam doesn't generally set as hard as bought jam