Ingredients

• 700 g ripe blackberries
• 500 g sugar
• juice of one lemon

To prepare the blackberry jam, in a double-bottomed casserole, boil the blackberries for 5 'together with the lemon juice; add the sugar and, stirring often, continue boiling over medium heat up to a temperature of 105 °; pour the boiling jam into hot sterilized jars, seal tightly then let them cool very slowly, upside down, before placing them in the pantry.

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