Timur vs Black pepper
The short answer
Sold abroad as "Nepali pepper", and not a pepper. Black pepper is the berry of a tropical vine, Piper nigrum, and it burns through piperine, a compound that also acts on the heat receptor chilli uses. Timur is the husk of a thorny citrus-family shrub, and it does not burn at all: it tingles and numbs through sanshools, which work on touch-sensitive nerves instead. The two share a jar shape and a word and nothing else. Grinding timur over food the way you would pepper gives a lime-and-flower aroma and a buzzing lip; replacing it with black pepper in an achar gives heat and loses both.
Side by side
| Timur | Black pepper | |
|---|---|---|
| Botanical identity | Zanthoxylum armatum DC. | Piper nigrum L. |
| Part used | fruit | fruit, berry |
| Origin | Native across the Himalayan belt, from northern Pakistan through India, Nepal and Bhutan into southwest China, and into mainland Southeast Asia. | The Malabar coast of southwestern India. |
| Flavour notes | citric, floral, numbing, lime peel, resinous | pungent, woody, citrus, resinous, warming |
| 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. | Pungent and warming with a woody, faintly citric aroma behind the bite. The pungency builds and lingers rather than striking immediately as chilli heat does. |
| 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. | Woody, resinous and citrus-fresh, with a distinct piney lift that is lost quickly once ground. |
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.
Black pepper
This is the least ambiguous whole-versus-ground case in the entire spice cupboard. Pepper's pungency is non-volatile and its aroma is highly volatile, so pre-ground pepper reliably delivers the heat and reliably loses the fragrance. Buy whole and grind at the point of use; nothing else about pepper matters as much.
Full detail on timur and black pepper, including evidence grades and sources for every claim above.