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Wash the fruit, then tip into a preserving pan with the lemon juice and 300ml/1⁄2 pint water. Bring slowly to the boil, and simmer for 30-40 minutes until the fruit is soft.
Carefully pour the contents of the pan into a scalded jelly bag with a large bowl set underneath to catch the juice (see the Step-by-step photo). Leave for several hours.
Measure the juice back into the pan, then add 500g of sugar to every 500ml of juice or 1lb sugar for every pint of juice. Stir over a low heat until the sugar has dissolved, then raise the heat and rapidly boil until setting point is reached. Test this by spooning a little on to a chilled saucer. Cool slightly then push with your finger – if it wrinkles it is ready. If not return to the heat, boil for 5 more minutes and test again.
Pot into warm sterilised jars and cool before sealing. Can be eaten straight away, but keeps for up to a year.