The pickled cucumber (usually referred to as ‘pickle’ in the United States and Canada or generically as ‘gherkin’ in the United Kingdom, Ireland and Australia) is actually a regular cucumber that is pickled in vinegar, a brine or some other solution. It is then left to ferment for a certain period of time. Fermentation takes place by putting the cucumbers in an acidic solution or use lacto-fermentation to sour them.