Place the black currants and water in a heavy pot over medium low heat. Cook the fruit for about half an hour or longer, stirring occasionally, to soften the skins.
Add the sugar and lemon juice.
Increase the heat to simmer the jam briskly while constantly stirring. Use a candy thermometer to bring the temperature of the jam to 215°F (101.5°C) which should be reached in about 10 to 15 minutes.
Pour into warm, dry jars which have been rinsed with boiling water, along with the lids.
Process to seal, if desired, but you can just keep it in the fridge to be on the safe side. I make sure to hear/see my lids pop to ensure a seal.
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