For Red and Black Raspberries and Blackberries
Ingredients
Directions
Cook the fruit
Combine the fruit, sugar, and water in a pot.
Heat the mixture on the stove until it is hot throughout.
Boil for no more than 5 minutes.
Jar
Pour into cans while hot.
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
- Fruit
- Provides the main flavor and natural pectin that gives the jam its body.
- Sugar
- Adds sweetness and, with the fruit's pectin, helps the jam thicken and set.
The step that matters
Boil for no more than 5 minutes. Pectin and fruit acids gel best over a short, hard boil. Boiling longer breaks down pectin and concentrates the sugar, which can leave the jam too stiff or prevent it from setting properly.
“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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