Put stones in plastic bag and crush with rolling pin.
Tie crushed stones up in a piece of muslin so they don't get loose in the jam
Mix the sugar, plums, the bag of stones and the lemon rind and juice together along with the chopped mint leaves and set aside in a large pan to macerate for an hour (or leave over night if possible) This allows the juice to be released from the plums and the sugar to start dissolving.
Bring the pan up to the boil and keep boiling for about 20 minutes or until it has reached setting point - test a spoonful on a well chilled plate, when set has been reached it will wrinkle when you run your finger through the jam after a few minutes.
Scim off any scum and allow to cool a little before spooning into sterilised jars.
Notes
Calories shown for entire quantity of minted mirabelle plum jamThis jam is great as a glaze on roast pork or ham and in Asian inspired dishes too
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