Blackberry Jam
Ingredients
Directions
Mash the blackberries in a large pot.
Add the sugar to the mashed berries.
Heat the mixture until it is hot.
Boil for 25 minutes, stirring constantly.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
Explore the science
What each ingredient does
- Blackberries
- Provide the fruit body, flavour and natural pectin that gives the jam its base texture.
- Sugar
- Sweetens the jam and helps it thicken and set as it cooks down.
The step that matters
Boil for 25 minutes, stirring constantly. Sugar and fruit need sustained boiling to reach the concentration needed for a gel. Constant stirring prevents scorching on the bottom of the pot, which would make the jam taste burnt.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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