1 3 lbs Fresh Blackberries or other fresh berries (about 10 cups) 2 3 cups Sugar , white. 3 3 T . Lemon or Lime Juice. 4 1/3 cup low sugar Pectin -or- 1 pkg Sure Jell for low or no sugar jam.
Mash and strain seeds from blackberries using a chinois. Measure out 8 cups of strained fruit for jam. Put 8 cups of fruit, sugar and lemon juice in a heavy stockpot over medium heat. Stir until sugar is dissolved. Continue cooking over medium heat until mixture comes to a boil. Stir every few minutes to prevent scorching.
Easy Seedless Blackberry Jam (aka Seedless Bramble Jam) is a delicious small batch jam made with just 3 ingredients: blackberries, granulated sugar, freshly squeezed lemon juice and no pectin. Easy Seedless Blackberry Jam (Prize Winning)
In comparison, when you pick the raspberry, the torus comes off. Meaning, when you pick the raspberry without the stem, the core stays hollow. However, for the seedless blackberry jam, just make sure that you clean and stem the blackberries properly before you get to the jam-making part.