The day before you wish to make the jam, hull and halve the strawberries. Check for soft spots (which must be removed) and discard any berries with bruises or that are overripe.
Place the strawberries into a large bowl with 500g/18oz of the sugar. Turn carefully to mix and coat well, then cover with cling film and place into the fridge overnight.
The next day, place a saucer into the freezer to chill - you'll need this when you come to test the setting point of the jam.
Sterilise the jam jars - first wash the jars in soapy water and rinse in clean warm water. Allow them to drip-dry, upside down, on a rack in the oven set to 140C/275F/Gas 1. Leave them there for at least half an hour while you make the jam.
Pour the strawberries, their juice and any residual sugary juices into a very large pan or preserving pan, remembering that the mixture will rise as it boils, and add the remaining 500g/18oz sugar and the lemon juice.
Stir over a gentle heat until the sugar has completely dissolved.
Bring the strawberries up to the boil then boil hard until the jam reaches setting point. Check the setting point every ten minutes, although it may take up to half an hour to reach setting point.
To test the setting point, remove the pan from the heat. Take your saucer from the freezer and place a drop of jam onto the cold plate. After a few seconds push the jam with your finger.
If the jam surface wrinkles then it has reached setting point and is ready. If it slides about as a liquid, then it hasn't reached setting point and should be returned to the heat and boiled for a few more minutes before testing again.
When setting point has been reached, turn off the heat. Stir in the butter and skim off any scum on the surface of the jam with a large spoon.
Instructions
The day before you wish to make the jam, hull and halve the strawberries. Check for soft spots (which must be removed) and discard any berries with bruises or that are overripe.
Place the strawberries into a large bowl with 500g/18oz of the sugar. Turn carefully to mix and coat well, then cover with cling film and place into the fridge overnight.
The next day, place a saucer into the freezer to chill - you'll need this when you come to test the setting point of the jam.
Sterilise the jam jars - first wash the jars in soapy water and rinse in clean warm water. Allow them to drip-dry, upside down, on a rack in the oven set to 140C/275F/Gas 1. Leave them there for at least half an hour while you make the jam.
Pour the strawberries, their juice and any residual sugary juices into a very large pan or preserving pan, remembering that the mixture will rise as it boils, and add the remaining 500g/18oz sugar and the lemon juice.
Stir over a gentle heat until the sugar has completely dissolved.
Bring the strawberries up to the boil then boil hard until the jam reaches setting point. Check the setting point every ten minutes, although it may take up to half an hour to reach setting point.
To test the setting point, remove the pan from the heat. Take your saucer from the freezer and place a drop of jam onto the cold plate. After a few seconds push the jam with your finger.
If the jam surface wrinkles then it has reached setting point and is ready. If it slides about as a liquid, then it hasn't reached setting point and should be returned to the heat and boiled for a few more minutes before testing again.
When setting point has been reached, turn off the heat. Stir in the butter and skim off any scum on the surface of the jam with a large spoon.
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