Download our printable preserves labels – perfect for writing cook’s notes and gift messages. You can find them here.
Combine all the ingredients, except the vinegar, in a large saucepan. Stir mixture over medium heat until the blackberries burst. Season with salt and pepper, to taste. Add the vinegar and allow the mixture to simmer uncovered for 10 mins. Cool, transfer to a sterilised jar and seal immediately.