🇸🇦 Arabicar
فلفل سانشو
filfil sansho
Honshu, Japan, Japan
Sansho Pepper
1,300 y
of documented Japanese use
mentioned in the Nara-period Man'yōshū
1.5%
hydroxy-α-sanshool
of the dry pericarp
2–4%
essential oil
citrus-forward profile
4
named cultivars in Japan
Arima, Asakura, Budō, Takahara
Visual atlas
Profile
Zanthoxylum piperitum, also known as Japanese pepper or Japanese prickly-ash, is a deciduous aromatic spiny shrub or small tree of the citrus and rue family Rutaceae, native to Japan and Korea.
Sansho is the dried fruit husk of Zanthoxylum piperitum, a thorny deciduous shrub endemic to Japan, Korea and parts of China. Although it belongs to the same citrus-family genus as Sichuan pepper, Japanese sansho is a distinct species with its own flavour signature: less numbing, markedly more citrus-forward, with a shimmering tingle driven by hydroxy-α-sanshool rather than the hydroxy-β-sanshool dominant in Sichuan pepper. Only the pericarp is used — the black seeds inside are gritty and bitter and are sifted out before milling. Ground to a fine powder called kona-zansho, it is the classic dusting on grilled freshwater eel (unagi no kabayaki) and on miso-glazed yakitori. Kinome, the young green leaves of the same plant, is used fresh in kaiseki cuisine as a spring garnish for clear soups, simmered bamboo shoots and grilled tofu dengaku.
Origin
Honshu, Japan, Japan.
Japan
Honshu, Japan · Arima, Wakayama (Japan)
Process
01April
Kinome leaves
The first young leaves appear — bright green, fragrant of citrus and mint. Chefs pluck them by hand for suimono and dengaku garnish.
02May
Flowering
Zanthoxylum piperitum puts out small yellow-green flowers. Only female trees set berries; male trees contribute pollen only.
03June–August
Green fruit
Ao-zansho: the unripe green berries are picked for tsukudani (simmered in soy-sugar) and for pickling with fish.
04September–October
Ripening
Berries turn from green to red. Fully ripe hulls split, revealing the glossy black seed. The red pericarp (not the seed) is the aromatic treasure.
05Sun-dry
Hulling & drying
Ripe berries are dried in the sun; the black seed inside is discarded (too bitter) and only the split red hull is kept.
06Your jar
Kona-zansho powder
The hull is stone-milled to a fragrant powder. Dusted on unagi, miso soup, grilled pork — never cooked, always added off heat.
Inside the berry
The molecules that make it taste like Kampot — and not like anything else.
GC-MS of Zanthoxylum piperitum (Wakayama): citronellal and limonene dominate the oil; hydroxy-α-sanshool is present but below Sichuan-pepper levels, giving a softer paresthetic tingle.
1.5%
Hydroxy-α-sanshool
vs 3% in Sichuan pepper
3.2%
Essential oil
of dry pericarp
35%
Citronellal
of the volatile oil
40+
Volatile compounds
identified in Japanese GC-MS
Volatile compound profile
- Citronellal35.0%
Bright lemon-grass citrus — the top note of sansho.
- Limonene14.2%
Fresh citrus peel — gives kinome its clean green lift.
- Geraniol8.4%
Rose-lemon — rounds the top into a floral centre.
- β-phellandrene6.1%
Mint-pepper-pine — the cool undertone.
- Hydroxy-α-sanshool1.5%
Not aroma — the tingle molecule. 50 Hz paresthetic vibration.
- Linalool2.3%
Floral lavender-citrus — smooths the edges.
Versus other peppers
| Pepper | Sanshool | Oil |
|---|---|---|
★ Sansho (Arima) Japan · citrus-forward, mild tingle | 1.5% | 3.2% |
Sichuan (hong hua jiao) China · stronger tingle, more pine | 3.0% | 4.0% |
Sichuan (green, qing hua jiao) China · citrus edge, cooler | 2.6% | 5.0% |
Timut (Nepal) Nepal · grapefruit-passionfruit | 1.8% | 4.2% |
Voatsiperifery Madagascar · different genus, piperine-based | n/a | 3.5% |
Cuisines
How the world cooks with it.
3 signature dishes
Sansho is one of the seven classic Japanese shichimi spices and the compulsory dusting on unagi eel.
- Unagi-dongrade: arima-sansho
Grilled eel on rice with tare sauce — kona-zansho at the table.
- Chirimen-zanshograde: arima-sansho
Baby sardines simmered with green sansho berries — Kyoto delicacy.
- Miso soup with kinomegrade: kinome-leaves
Red miso broth garnished with a clapped kinome leaf.
Around the world
What it's called, from Phnom Penh to Palermo.
🇧🇩 Bengalibn
সানশো মরিচ
sansho morich
🇨🇳 Chinesezh
日本山椒
rìběn shānjiāo
🇳🇱 Dutchnl
Sansho-peper
🇬🇧 Englishen
Sansho pepper
🇫🇷 Frenchfr
Poivre sansho
🇩🇪 Germande
Sansho-Pfeffer
🇮🇳 Hindihi
सांशो मिर्च
sansho mirch
🇮🇩 Indonesianid
Merica sansho
🇮🇹 Italianit
Pepe sansho
🇯🇵 Japaneseja
山椒
sanshō
🇰🇷 Koreanko
산초
sancho
🇲🇾 Malayms
Lada sansho
🇵🇹 Portuguesept
Pimenta sansho
🇷🇺 Russianru
Перец саншо
perets sansho
🇪🇸 Spanishes
Pimienta sansho
🇮🇳 Tamilta
சான்ஷோ மிளகு
sansho milagu
🇹🇭 Thaith
พริกไทยซันโช
phrik-thai sansho
🇹🇷 Turkishtr
Sanşo biberi
🇵🇰 Urduur
سانشو کالی مرچ
sansho kali mirch
🇻🇳 Vietnamesevi
Tiêu sansho
Seasonality
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Peak (kinome in May, red berry Sep)Green berry harvestDried, jarred
Pairings
Protein
- Unagi grilled eel
- Miso soup
- Chirimen-zansho
- Grilled pork belly
Sweet
- Matcha ice cream
Substitutes
Frequent questions
They're cousins (both Zanthoxylum), but sansho (Z. piperitum) carries roughly half the hydroxy-α-sanshool of Sichuan pepper (Z. bungeanum / Z. simulans) — so the tingle is milder. Its volatile profile is also citrus-forward (citronellal, limonene, geraniol) rather than pine-forward, so the nose is brighter, closer to lemon-leaf than incense.