Well, there is in fact a difference, but it's a subtle one. In general terms, a gherkin is simply a small type of cucumber used specifically for pickling purposes. A cornichon is also a gherkin ...

Cucumbers are in season from May to October, but are available year-round. Look for firm, vibrantly green fruit without wrinkles. Smaller ridged cucumbers differ little in taste to the more common ...

Store fresh cucumbers in the fridge for up to one week. Small examples, or sliced cucumbers can be pickled very successfully: pickled cucumbers are also known as gherkins or cornichons.