Blackberry Jam
Ingredients
Directions
Start the jam
Combine blackberries, sugar, and water in a pot.
Heat slowly until the sugar dissolves, stirring occasionally.
Cook and store
Boil rapidly and skim off any foam.
Cook until thick, about 15 to 20 minutes.
Pour into cups or glasses for storage.
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 main fruit flavor and the body of the jam.
- Sugar
- Sweetens the jam and helps it thicken and set as it cooks.
The step that matters
Cook until thick. Jam sets as water evaporates and the sugar and fruit pectin concentrate at a high temperature. Stopping too early leaves a runny jam, while cooking too long can scorch the sugar and make it stiff.
“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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