http://www.durgan.org/URL/?KRKOL 4 July 2011 Blackcurrant (Ribes nigrum)
The one blackcurrant bush in the garden furnished four pounds of perfect berries. All the berries were black, every single one,almost of uniform size, and about one in 100 was ripe enough to fall when touched. My new criteria for deciding when to pick. Juice was made by covering with water (two litres), boiling for about 15 minutes and beating into a mash using the portable blender. I did not strain since there was little roughage in the berries. The three litres of juice obtained was pressure canned for long term storage at room temperature. I used 15 PSI for 15 minutes. The end product is rather thick, a bit tart, so half a glass is probably a reasonable amount for a serving.