Blackberry Jam
Ingredients
Directions
Combine blackberries and sugar in a pot.
Stir constantly and boil hard for 20 minutes.
Once the sugar is dissolved, fill jars quickly.
Cover the jars immediately.
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, pectin and flavor that form the body of the jam.
- Sugar
- Sweetens the jam and helps it thicken and keep by binding water.
The step that matters
Stir constantly and boil hard for 20 minutes. Sugar and fruit pectin only set into a gel at a high concentration and temperature. Constant stirring prevents scorching on the bottom of the pot, and a hard boil drives off water so the jam thickens rather than staying runny.
“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.