http://www.durgan.org/URL/?SASIO 31 August 2011 Niagara Grapes
About forty five pounds of Niagara Grapes were picked from one plant and made into juice. It takes about three pound of these grapes to make a liter of pure juice, with no water added.
Juice was made by washing, plucking the grapes from the support structure, boiling slightly, making a mash using the portable hand blender, separating the juice from the fiber by screening, placing in liter jars, and pressure canning at 12 PSI for 15 minutes for long term storage at room temperature.
These grapes are slightly tart, but make a refreshing drink, and is a good substitute for wine without the alcohol.