Blackberry Jam
Ingredients
Directions
Mash the blackberries in a bowl.
Mix the mashed blackberries with the sugar.
Transfer the mixture to a pot and boil for 30 to 45 minutes.
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 bulk, flavour and natural pectin that help the jam thicken as it cooks.
- Sugar
- Adds sweetness and, with heat, helps the jam thicken and keeps it preserved.
The step that matters
Boiling the blackberry and sugar mixture. Jam sets as water evaporates and pectin and sugar concentrate. Boiling too briefly leaves it runny, while boiling too long can scorch the sugar and dull the flavour. Watch for a thickened texture rather than relying on time alone.
“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.
More blackberry jam recipes
You might also like
White Cake431 recipes
Pound Cake373 recipes
Orange Bundt Cake349 recipes
Spice Cake344 recipesThe free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.