Name: Black Raspberries and Blackberries
Ingredients: 1 quart black raspberries or blackberries; 2 cups sugar

Black Raspberries and Blackberries

Ingredients

1 quart black raspberries or blackberries
2 cups sugar

Directions

Combine the berries and sugar in a pot.
Boil for 15 minutes.
Pour the mixture into air-tight jars.

Recipe from a historical cookbook (Internet Archive).

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

Berries: Provide the fruit flavour, colour and pectin-bearing body that the preserve is built around.
Sugar: Adds sweetness and helps thicken the preserve while preserving it against spoilage.

“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.