http://www.durgan.org/URL/?VCJSF 14 August 2010 Making Blackberry Juice.
Many blackberries are available, so juice is being made of the excess. A container of four cups of berries is filled with water, placed in a pot on the stove and gently boiled for about 20 minutes, with periodic mashing. The cooked mash is then run through a fine mesh screen. The finished product is of fine quality and nothing added. Pure!