are unripe blueberries safe to eat?
Green blueberries are not usually eaten raw; they are most often cooked or pickled. They can be used to make a verjus, or verjuice, which is traditionally made with the unripened grapes that were picked to thin the vines. ... They can be pickled, for achar (a tart, spicy and sweet Indian condiment) or a chutney.