Jellied eels is a traditional Cockney street food item, dating back to the 18th century. Originally, it was a cheap and easy way to make a good dish, with plenty of native eels readily available in the Thames River. The eels would get chopped, boiled for approximately half an hour in herbs, then cooled - that is when the fish would produce their own gelatin, and a soft, transparent jelly would form on the cut pieces.

The texture of jellied eels is delicate and soft, and while some may say it's unpleasant, their flavor is unique - mild, slightly salty, like pickled herring, but without the unusual "fishy" scent. They are commonly accompanied by white pepper and vinegar in order to further accentuate the flavors.

The dish can be served either hot or cold, and according to jellied eels experts, it tastes perfect when paired with chili vinegar.