Radhuni vs Celery seed
The short answer
The translation almost every English Bengali recipe makes, and the reason those recipes taste slightly off to people who grew up with them. Radhuni is Trachyspermum roxburghianum, a relative of ajwain; celery seed is Apium graveolens. Both are tiny Apiaceae seeds with a celery smell, and both are fried whole in oil. Radhuni is sharper, with a parsley and thyme edge; celery seed is rounder, grassier and a little bitter. Celery seed is the right substitute and the wrong translation — use it, at the same quantity, knowing it is close rather than the same.
Side by side
| Radhuni | Celery seed | |
|---|---|---|
| Botanical identity | Trachyspermum roxburghianum (DC.) H.Wolff | Apium graveolens L. |
| Part used | seed | seed |
| Origin | South and Southeast Asia; the species is grown and naturalised from eastern India and Bangladesh into mainland Southeast Asia. | The Mediterranean basin and western Asia, where the wild form grows on damp and brackish ground, with seed production now concentrated in India. |
| Flavour notes | celery, parsley, herbal, savoury, sharp | earthy, bitter, herbal, warm |
| Heat | Scoville does not apply | Scoville does not apply |
| Flavour | Savoury, green and warm, bitter only if burnt. In hot oil it gives a dish a distinctly Bengali smell that is hard to place for anyone who has not grown up with it. | Intensely celery-like with a pronounced bitterness that the vegetable does not have, and a warm slightly nutty finish. The bitterness is the thing to respect: celery seed is not a concentrated stock cube so much as a concentrated celery leaf, and used at vegetable-like quantities it turns a dish harsh. |
| Aroma | Celery and parsley, with a sharper, slightly thyme-like top note that celery seed lacks. | Immediately and unmistakably celery, and far more concentrated than the vegetable — green, slightly medicinal, with a warm earthiness behind it. A jar opened in a kitchen is recognised instantly by anyone who has eaten celery. |
Can you swap them?
Substitution is directional: the answer is often different in each direction, and both are recorded.
Celery seed
Good matchUse: 1× by volume — The same volume. Both are tiny whole seeds used as a tempering.
The nearest thing to radhuni that most kitchens have, and the one most English recipes already assume. The dal smells of celery, which is right, and lacks the sharper parsley-and-thyme edge, which is noticeable only to someone who knows the original.
| Flavour | Aroma | Colour | Heat |
|---|---|---|---|
| close | partial | close | n/a |
Works for
- Dal tempering
- Vegetable dishes
- Panch phoron in the radhuni style
Does not work for
- Anyone cooking to reproduce a specific Bengali family dish — the difference is real to those who grew up with it
Which should you buy?
Radhuni
Whole. Radhuni is used as a tempering seed, and the whole seed fried in fat is the use; there is little reason to buy or make it ground.
Celery seed
Buy whole, and buy a small jar. Whole celery seed keeps for two years or more where ground fades within months, and most of its uses — pickles, brines, dressings, stocks — want it whole anyway. Grind it yourself if a rub calls for it, and use about half what you would use whole, because grinding sharpens the bitterness. Be clear about what you are picking up: celery salt is mostly salt and is a seasoning rather than a spice, and swapping it for celery seed by volume will oversalt whatever it goes into. And check the smell before buying if you can, since spent seed with the oil extracted looks exactly like the real thing.
Full detail on radhuni and celery seed, including evidence grades and sources for every claim above.