Blackberry Jam
Ingredients
Directions
Prepare
Wash the blackberries thoroughly.
Cook the jam
In a pot, combine the blackberries and sugar.
Cook over medium heat, stirring frequently, until the mixture thickens.
Jar
Pour the jam into sterilized 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
- Provide the fruit, flavor and natural pectin that help the jam set as it cooks.
- Sugar
- Adds sweetness and, by binding water, helps the jam thicken and keep longer.
The step that matters
Cooking until the mixture thickens. Jam sets as water evaporates and sugar and fruit pectin form a gel. Stopping too early leaves runny jam, while cooking too long can make it stiff and dull.
“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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