Prepare the fruit – Wash the blackberries and peel, core, and chop the apples into small pieces.

Cook the apples first – Place the apples and water in a saucepan and cook until the apples soften.

Add blackberries – Stir in the blackberries and cook gently until the fruit breaks down.

Mash slightly – Use a spoon or potato masher to break the fruit mixture into a smoother texture.

Add sugar and lemon juice – Stir in the sugar and lemon juice until the sugar dissolves completely.

Bring to a rolling boil – Increase the heat and boil the mixture rapidly for about 10–15 minutes.

Test the jam set – Place a spoonful of jam on a chilled plate. If it wrinkles when pushed, the jam is ready.

Remove foam – Skim off any foam from the surface for a clearer jam.

Fill sterilized jars – Carefully ladle the hot jam into sterilized jars.

Seal and cool – Close the jars tightly and allow them to cool completely.