Pickles are actually cucumbers that are fermented in vinagar or brine to preserve them. That is where they get their sour taste. It is not known specifically where the pickling process comes from, however the earliest known use of the term originates from somewhere in central Europe circa 1440 A.D.
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A pickle (typical made from a cucumber, but not always) is a vegetable that has been preserved in a brine, vinegar ,or spice solution.