Jellied eels are pieces of eel, stewed in a spiced stock and left to cool, at which point the liquid sets into a savoury jelly around them. They are eaten cold, from a bowl, with vinegar and white pepper.
It is the food most often produced when someone wants to demonstrate that British cooking is strange, and the reputation is not entirely undeserved.
Why jelly
No gelatine is added. Eel skin and bone are exceptionally high in natural collagen, so the cooking liquor sets solid on its own as it cools. The dish exists because of that chemistry.
It also explains why it caught on. Set in jelly and kept cool, eels lasted for days without refrigeration, which mattered enormously to nineteenth-century street food.
Why eels, in London
Because the Thames was full of them. Eels thrived in water too polluted for most other fish, they were caught in enormous quantities, and they were correspondingly cheap. For the poor of Victorian London, eels were one of the few reliable sources of protein available.
Eel, pie and mash shops served both — and the water the eels were stewed in became the liquor poured over the pies next door. See pie and mash.
Tubby Isaac’s stall near Aldgate, founded in 1919, was the most famous eel stall in London and traded until 2013.
What it tastes like
Milder than expected. The eel itself is firm and faintly sweet, closer to a meaty white fish than to anything oily. The jelly is savoury and lightly spiced, and it is the texture rather than the flavour that people struggle with — cold, wobbling, and with small bones in it.
Vinegar is essential, and white pepper traditional. Eating them warm, before the jelly has set, is a different and considerably more approachable dish.
The decline
Two forces, and both are decisive.
First, the customers left. The East End communities that ate jellied eels dispersed after the war, and younger generations did not take up the habit.
Second, and more seriously, the European eel is critically endangered. Populations have collapsed by well over 90% since the 1980s, through a combination of overfishing, river barriers blocking migration, parasites and changes to ocean currents. Trade in European eel outside the EU is banned under CITES.
The eel’s life cycle is genuinely extraordinary and part of why it is so vulnerable: they spawn in the Sargasso Sea, drift as larvae across the Atlantic over a period of years, migrate up European rivers as glass eels, live for decades in fresh water, and then return to the Sargasso to breed once and die. No one has ever observed them spawning.
Where to try them
A handful of traditional shops in East and South East London still serve them, along with a few stalls and markets. They are also sold in tubs in some supermarkets, which is not the same thing.
Anyone wanting to try jellied eels should probably do so soon, and might reasonably feel conflicted about it.