In many markets you might find several different kinds of cucumbers. My former employer, Bon Appetit, has a terrific article on supermarket cukes. There is the classic basic cucumber, which is called a Pole cucumber; there are often hothouse, also called English cucumbers; and increasingly we have been able to easily find Persian. In our stores they come pre-packaged with 6 to a pack. They can also be referred to as “mini” and “baby”.   Persian cucumbers are short – about 6-inches (15 cm) long – slender, with a thin skin, hardly any seeds (and the seeds are tiny), they are crisp and dense. No need to peel.   Persian cucumbers are much, much less watery than Pole cukes, and much sweeter and their texture is just all around better. Please do not substitute Pole cucumbers. If you need a substitute, buy the hothouse, partially peel, seed them, then chop them up. Here they are below, held in my hand so you can see dimensions .