Frozen Blackberry Jam. You can make some damned fine jam from frozen fruit. Let stand for 10 minutes.

Boil for 1 minute stirring constantly. Blackberry Plum Jam with Seville Orange Juice. Jam made from frozen fruit will taste infinitely fresher and more delicious than a six- or seven-month-old jam even if it is made in peak season.
1 pound frozen blackberries 2 pounds frozen plums 2 pounds sugar 12 cup sour Seville orange juice juice of 1 Eureka lemon.
Jam made from frozen fruit will taste infinitely fresher and more delicious than a six- or seven-month-old jam even if it is made in peak season. Blackberry Plum Jam with Seville Orange Juice. 1 pound frozen blackberries 2 pounds frozen plums 2 pounds sugar 12 cup sour Seville orange juice juice of 1 Eureka lemon. Set the bags of frozen fruit out to defrost for about half an hour.