Blackberry Jam
Ingredients
Directions
Cook the fruit
Mash the blackberries in a pot.
Cook the mashed berries for 20 minutes over medium heat.
Add sugar and seal
Add the brown sugar and bring to a brisk boil for 10 minutes.
Seal the jam in sterilized jars.
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 base, flavor and body of the jam as they break down.
- Brown sugar
- Adds sweetness and, with boiling, thickens the jam and helps it keep.
The step that matters
Boiling with the sugar. The brisk boil must be long enough to concentrate the mixture. Sugar binds water, so enough evaporation lets the jam thicken and set; too little boiling leaves it runny and less stable in storage.
“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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