High-pectin fruits include: blackcurrants, redcurrants, cooking apples, damsons ... it should be added to the fruit before the sugar. When making jam, always use fruit that's in peak condition ...
Peel the apples and grate them ... Add the maple syrup, sugar and lemon juice, bring to a boil then cook until the mixture reaches 105C/220C on a sugar thermometer. Stir frequently to stop ...