Blackberry Jam
Ingredients
Directions
Boil the blackberries in a little water until perfectly tender.
Add the sugar and boil hard for 20 minutes.
Bottle and seal the jam.
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 flavor and pectin-rich body that the jam sets around.
- Sugar
- Sweetens the jam and helps it set and keep by drawing water away from the fruit.
The step that matters
Boil hard after adding the sugar. Sugar must be dissolved and the mixture brought to a hard, rolling boil for the full time so the pectin and acid can gel the jam. Too short a boil leaves it runny and more prone to spoiling.
“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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