Blackberry Jam
Ingredients
Directions
Prepare
Wash and remove caps from the blackberries.
Run the berries through a meat grinder.
Cook and jar
Combine the ground berries and sugar in a pot.
Cook rapidly for 35 to 40 minutes.
Pour the jam into jars and seal.
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 flavour, pectin and bulk that form the jam's body.
- Granulated sugar
- Sweetens the jam and helps it thicken and set as it cooks down.
The step that matters
Cook rapidly for 35 to 40 minutes. Boiling drives off water so the sugar and fruit pectin can concentrate and set. Undercooking leaves a runny jam, while overcooking can scorch the sugar and dull the fresh fruit flavour.
“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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