Squeeze the black currant juice ahead of time (to remove the seeds).
Place all of the ingredients into a pot and let sit for 30 minutes.
Once the sugar has dissolved, turn the heat to medium. Cook while stirring and making sure it doesn't burn. Remove any scum that rises to the surface. Once the fruit becomes soft, mash it up. (This will take about 30 minutes.)
Once it thickens, it's done Store in a sterilized jar in the refrigerator. Since it's low-sugar, use it up within 1 month.
Story Behind this Recipe
I thought these were similar to blueberries, but when I ate some, there was no flavor!!! One good thing about the subtle flavoring was that I could make a jam as sour as I wanted.
Adjust the amount of sugar to taste. Since I was planning to use this to make sweets, I reduced the sugar.