Blackberry Jam

Blackberry Jam

Blackberry Jam recipe


  • 1.25kg blackberries
  • Finely grated zest and juice of 2/3 large limes or 1/2 lemons
  • 1.25kg jam sugar (with added pectin)
  • You will also need a sugar thermometer



  1. Put the berries, lime/lemon zest and juice into a large pan and cook over a low heat, stirring now and then, until the berries are soft and plenty of juice has been released. Press gently with a potato masher to release even more juice and break up some of the fruit, but don’t reduce all the berries to pulp.
  2. Add the sugar, then stir for about 10 minutes until the sugar dissolves. This is important to prevent the jam from crystallising during storage. Increase the heat, then boil steadily for 7 minutes until setting point is reached 105°C.
  3. Remove the pan from the heat, skim the scum off the surface. Leave for 5 minutes for the fruit to settle down into the syrup. Stir well, pour the hot jam into warm sterilised jars (put Jars in oven set at 40 for 15 mins) then immediately cover with waxed discs and lids. Label, then store in a cool, dark place.
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