This may work. I'm trying this recipe using a combination of figs and raspberries. You could substitute the blackberries for the raspberries.
FROG JAM (Fig, Raspberry, Orange, Ginger)
4 cups of Figs
2 cups of Raspberries
1/2 cup fresh Orange juice
1 TSP of minced Ginger
1 pinch of clove seasoning (optional)
2 1/2 cups of white sugar
1 pouch of liquid pectin
1 TSP of lemon Juice
1. In a blender mix and mash all the fruits together.
2. Allow to sit for 30 minutes
3. Place fruit mixture in a large pot
4. Mix in the liquid pectin with the sugar.
5. Bring the mixture to a rolling boil over high heat.
6. Stir continuously
7. When thick lower the heat to a low heat for 45 minutes
8. Add a pinch of clove and continue to boil for 1 minute.
9. Remove from the heat.
10. Continue to stir for five minutes
11. Remove from heat and skim foam from surface
12. Ladle mixture into sterilized pint jars leaving 1/4 inch of headspace.
13. Wipe the jar rims with a clean cloth and attach lid.
14. Seal and water bath process for 10 minutes.
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