Blackberry Jam
Ingredients
Directions
Prepare
Pick the blackberries clean in dry weather.
Cook
Combine the blackberries and sugar in a pot.
Boil the mixture for 45 minutes to 1 hour, stirring continuously.
Jar
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
- Supply the fruit, flavor and natural pectin that helps the jam thicken and set.
- Coarse brown sugar
- Sweetens the jam, adds molasses flavor, and helps it set and keep by binding water.
The step that matters
Boiling with constant stirring. The jam must boil long enough for sugar and pectin to reach a concentration that gels. Constant stirring prevents the sugar from scorching on the bottom of the pot, which would add a burnt flavor.
“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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