Blackberey Jam
Ingredients
Directions
Mash the blackberries in a bowl.
In a separate bowl, combine the mashed blackberries with the sugar.
Boil the mixture for 30 to 45 minutes, stirring occasionally.
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 base, flavour and most of the jam's body once cooked down.
- Sugar
- Sweetens the jam and helps it thicken and set as it cooks.
The step that matters
Boiling the mixture. Sugar and fruit pectin must reach a high enough concentration at a rolling boil for the jam to thicken and set. Too little cooking leaves it runny, while overcooking can darken and scorch the sugar.
“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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