A gherkin is not only a pickle of a certain size but also a particular species of cucumber: the West Indian or Burr Gherkin (Cucumis anguria), which produces a somewhat smaller fruit than the garden cucumber. Standard pickles are made from the Burr Gherkin, but the term gherkin has become loosely used as any small cucumber pickled in a vinegar brine, regardless of the variety of cucumber used.
Kosher dill (US)Edit
A "kosher" dill pickle is not necessarily kosher in the sense that it has been prepared in accordance with Jewish dietary law. Rather, it is a pickle made in the traditional manner of Jewish New York City pickle makers, with generous addition of garlic and dill to a natural salt brine.
In New York terminology, a "full-sour" kosher dill is one that has fully fermented, while a "half-sour," given a shorter stay in the brine, is still crisp and bright green. Elsewhere, these pickles may sometimes be termed "old" and "new" dills.
The Polish-style pickled cucumber is a variety developed in the northern parts of Europe. It has been exported worldwide and is found in the cuisines of many countries. It is sour, similar to kosher dills, but tends to be seasoned differently. It is usually preserved in wooden barrels. A cucumber only pickled for a few days is different in taste (less sour) than one pickled for a longer time and is called ogórek małosolny, which literally means 'little salt cucumber'. This distinction is similar to the one between half- and full-sour types of kosher dills (see above).
Another kind of pickled cucumber, popular in Poland, is ogórek konserwowy ('preserved cucumber') which is rather sweet and vinegary in taste, due to different composition of the preserving solution. It is kept in jars instead of barrels or cans.
Lime pickles are soaked in lime rather than in a salt brine. This is done more to enhance texture (by making them crisper) rather than as a preservative. The lime is then rinsed off the pickles. Vinegar and sugar are often added after the 24-hour soak in lime, along with pickling spices.
Bread-and-butter pickles are sweeter in flavor than dill pickles, having a high concentration of sugar or other sweetener added to the brine. Cucumbers to be made into bread and butters are often sliced before pickling.