What is the difference between timur and sichuan pepper?

Timur vs Sichuan pepper

The short answer

Two Zanthoxylum species, and the reason "green Sichuan pepper" and "red Sichuan pepper" are not two grades of one spice. Red huajiao is Zanthoxylum bungeanum: warm, woody, grapefruit-scented. Timur — the Nepali name for the green Sichuan pepper of the Chinese trade — is Z. armatum: sharper, greener, floral and lime-like, and for most people more aggressively numbing. The numbing compounds are the same family in both, so either will make the mouth tingle; the aroma is what the choice is about. A Nepali tomato achar or a Sichuanese green-pepper fish wants the green; mapo tofu and a red chilli oil want the red.

Side by side

Timur and Sichuan pepper compared side by side
	Timur	Sichuan pepper
Botanical identity	Zanthoxylum armatum DC.	Zanthoxylum bungeanum Maxim., Zanthoxylum simulans Hance
Part used	fruit	fruit
Origin	Native across the Himalayan belt, from northern Pakistan through India, Nepal and Bhutan into southwest China, and into mainland Southeast Asia.	Temperate and montane East Asia, with China the centre of cultivation and use.
Flavour notes	citric, floral, numbing, lime peel, resinous	citrus, floral, woody, numbing, bitter
Heat	Scoville does not apply	Scoville does not apply
Flavour	Citric and resinous at first, then the tingle: a buzzing, numbing sensation on the lips and tongue that arrives after a few seconds and lasts for minutes. It is not hot. A strong dose leaves the mouth feeling faintly electric.	The flavour is citric, floral and mildly bitter, but the flavour is not the point. Within seconds of chewing a husk the lips and tongue begin to buzz — a genuine tingling numbness, closer to a mild electric current or a limb waking up than to any taste. It builds, plateaus and fades over several minutes. Nothing else in this catalogue does this, and no amount of any other spice reproduces it.
Aroma	Sharp, floral and citric — lime peel, lemongrass and something close to lavender — over a faintly woody base. Where red Sichuan pepper suggests grapefruit and warm wood, timur is brighter and more perfumed.	Intensely citric — grapefruit and lemon peel — over a warm woody, faintly floral base. The citrus character is a family trait shared with the rest of the Rutaceae and is the first thing noticed on opening a fresh packet.

Can you swap them?

Substitution is directional: the answer is often different in each direction, and both are recorded.

Sichuan pepper

Good match

Use: ~1× by volume — Start at the same volume. Red Sichuan pepper is less sharp and, for most palates, a little less aggressive on the tingle.

The numbing survives intact, because it is the same class of compound. What changes is the smell: warmer, woodier and more grapefruit-like instead of sharp, green and floral. A tomato achar made with red Sichuan pepper is recognisably close and tastes rounder.

How the replacement compares on each sensory axis
Flavour	Aroma	Colour	Heat
close	partial	partial	n/a

Works for

Achar and chutneys
Cooked dishes where the tingle matters most

Does not work for

Green pepper oil and cold Sichuanese dishes built on the green species’ perfume
Anything where the olive-green colour is part of the presentation

Established culinary practice

Which should you buy?

Timur

Whole, and ground as needed. The perfume that distinguishes timur from red Sichuan pepper is the most fugitive part of it, and a jar of ground timur tastes mainly of tingle within a couple of months.

Sichuan pepper

Buy whole husks and buy them small. This is the strongest whole-over-ground recommendation in the catalogue, because what fades is not merely the aroma but the effect: an old jar of ground Sichuan pepper is inert, and the usual conclusion drawn is that the spice is overrated rather than that the jar is dead. Sieve the black seeds out before grinding — they are grit and bitterness and nothing else — and toast the husks for half a minute first. Then test one on your tongue. Nothing else in this cabinet tells you so directly whether you have wasted your money.

Full detail on timur and sichuan pepper, including evidence grades and sources for every claim above.