Prune juice is often produced using hot extraction methods, whereby the prunes are cooked in hot water, becoming a liquid extract, which is then processed into juice. The process of heating and extraction may occur several times with the same batch of prunes, with the collective extracts from each processing then mixed together to create the final product. Prune juice is a
mass-produced product. Prune juice is also produced as a
concentrate, whereby low temperature water is used to create a liquid extract. The concentrate has a high sugar content, and is used by food processors to enhance the flavor of and sweeten products, as a humectant to retain moisture in cookies and cakes, and as an ingredient in cereal bars to bind the ingredients. == History ==