Blackberry Jam
Ingredients
Directions
Prepare
Clean and thoroughly bruise the blackberries.
Cook the jam
Boil the fruit for 15 to 20 minutes before adding sugar.
Add ¾ pound of sugar to the fruit and boil for an additional 30 minutes, stirring almost 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
- Provides the fruit base, flavor, and natural pectin that helps the jam thicken.
- Granulated sugar
- Sweetens the jam and helps it thicken and set as it cooks down.
The step that matters
Stirring during the sugar boil. Once the sugar is added, the mixture is thick and sticks to the bottom of the pan, where it can scorch. Stirring almost constantly keeps the fruit moving and the heat even, and sugar concentrating in the fruit helps the jam set.
“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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