Blackberries
Ingredients
Directions
Fill the jars
Use zinc-covered, self-sealing jars.
Fill jars with blackberries and sugar in a 4:1 ratio.
Process the jam
Place jars in cold water in a wash boiler.
Heat the water to boiling.
Leave 1 inch of space at the top of the jars.
When the fruit rises to the top, quickly screw on the covers tightly.
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 flavor and most of the jam's bulk.
- Sugar
- Sweetens the jam and helps preserve the fruit and help it set.
The step that matters
Screw on the covers quickly and tightly. Covers must go on promptly while the jars are still hot so the contents cool into a vacuum seal. Waiting too long lets air in, and the seal may fail.
“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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