In the early summer, the kids often pick red blackberries. We enjoy them and occasionally have enough for a mixed berry jam. Oma told us the other day of a blackberry farm that had you pick berries for a very good price. We enjoyed picking around 30 pounds of blackberries and ate a pound or two also. They were very good.
Not wanting the berries to go to waste, we froze some, made fruit leather with some and Adrian made a pie. We used most of the berries for jam. It is wonderful on fresh sourdough bread! There are a lot of seeds in blackberries. If desired, strain part or all of the seeds.
This is a small batch jam recipe that uses very little sugar. For a sweeter jam, see notes.