Funny you mention blackberry.
We just brought up a jar of "Bumble Berry" jam from the cold room. A mix of all dark berries to include blackberry, black current, Saskatoon berry, honey berry, maybe to include some blue berry or raspberry.
I think the standard recipe is close to this.
6 cups mashed berries
7 cups sugar
package of pectin
Cook berries, add sugar, cook a bit, add pectin.
Put in hot jars, seal, process.
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Always fresh.
Keep your stick on the ice. Red Green
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