Raspberry or Blackberry Jam
Ingredients
Directions
The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare
Preheat the oven to 350°F (175°C).
Place the crushed sugar in the oven to heat, but do not let it melt.
Make the jam
Cook the fruit in a pot for 20 minutes.
Add the hot sugar to the fruit and let it boil for 10 minutes, stirring constantly.
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
- Raspberries or blackberries
- Provides the main flavor, bulk, and natural pectin and acid that help the jam set.
- Crushed sugar
- Sweetens the jam and, with the fruit's pectin, helps it thicken and set while preserving it.
The step that matters
Stirring constantly while the jam boils. Sugar-fruit mixtures scorch easily on the bottom of the pot at a rolling boil. Constant stirring spreads the heat evenly and prevents burnt flavor and sticking.
“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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