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Preserve Jars The luxury glass preserving jar with traditional Kilner styling features a very easy to use metal screw-top lid made up of two pieces , a replaceable vacuum seal and a metal screw band to secure the seal .

The screw band can be re-used up to 10 times but the vacuum seal is not re-usable and will need to be replaced after each use . Preserving is both an economic and environmentally friendly way to maximise your fruit and vegetable overstocks , and provided you follow the instructions , the jars will prove indispensable .

Strawberry Jam

INGREDIENTS

900g ( 2 lb ) fresh strawberries , washed and hulled 800g ( 1 3/4lb ) caster sugar 4 tablespoons lemon juice

METHOD

1 . Add all of the strawberries into a Kilner Jam Pan and crush with a potato masher . 2 . Add the sugar and lemon juice . Stir over a low heat until all of the sugar is dissolved . 3 . Increase the heat to high and bring the mixture to a rolling boil . 4 . Continue to stir and boil until the mixture reaches 105 ° C . 5 . Cool slightly , transfer to hot sterile Kilner jars , leaving about 1cm space between the lid and seal . Keeps for six months in a cool , dry cupboard . Once opened , refrigerate .