pungent · spicy-hot · pepper-heat
3 species
commercial mustards
black, brown, yellow/white
1-2%
essential oil yield
of dry seed (post-hydrolysis)
Canada #1
top exporter
Saskatchewan prairies lead global trade
5000 y
of recorded use
Indus Valley and Sumerian texts
Mustard seed is a three-species problem: yellow Sinapis alba, the mild one that fills American ballpark squeeze bottles; brown Brassica juncea, the Indian rai that powers Dijon and every tadka from Kerala to Kolkata; and black Brassica nigra, the rare, shattering-prone ancestor still used in old-style French grainy mustards. All three are Brassicaceae and all three are inert until you hurt them. Crushing and wetting the seed activates the enzyme myrosinase on the glucosinolates sinigrin and sinalbin, generating allyl isothiocyanate, the pungent volatile that burns the nose rather than the tongue. Cold water keeps the heat; hot water or vinegar kills it. Canada is the world's largest exporter, with Saskatchewan and Alberta supplying most of the global brown and yellow crop.
Tasting notes
pungent · spicy-hot · pepper-heat
Inert when dry and whole; aggressively pungent and sinus-clearing when crushed with cold water via allyl isothiocyanate. Yellow is mild, tangy, almost lemony; brown is sharp and nasal with horseradish drive; black is fiercely hot and volatile. Toasting whole seeds in oil flips the pungency completely into a nutty, popcorn-like sweetness.
Flavor compass
Prairie Provinces, CA.
The original European mustard — small, dark brown to black, with the highest sinigrin load of the three. Sharp, nasal, wasabi-fierce when crushed into water. Historic seed of Dijon mustard before the switch to brown, still the ritual seed of South Indian tempering (kadugu).
The workhorse — larger, coppery-brown seed, easier to mechanically harvest. The modern seed of Dijon mustard AOP, Bengali shorshe and Chinese green mustard. Hot but rounder than nigra, with a more earthy, horseradish-adjacent lift.
The mildest — pale yellow, round seed rich in sinalbin rather than sinigrin, which releases a softer, lingering warmth instead of the nose-hit. The seed of American ballpark mustard, English Colman's blends, pickling brines and brewing (mustard IPA additions).
Brown and yellow mustard go into Canadian prairie soil shallow; germination in 4-7 days. Black mustard (Brassica nigra) is now rarely farmed at scale - it shatters too easily.
Fields of yellow cruciferous flowers attract honeybees. Pollinators drive up to 20% of yield. Seed set starts within weeks.
Tiny siliques form along the stem, each holding 10-15 spherical seeds. Yellow mustard (Sinapis alba) produces pale cream seeds; brown (B. juncea) gives reddish-brown.
When pods turn brown, farmers swath the field - cut and let dry in windrows for 7-10 days. Cutting standing mustard shatters the crop.
Combine harvesters thresh at seed moisture 8-10%. Over 12% and seed moulds; under 7% and it shatters on the auger.
Dry seed is flavourless. Myrosinase and sinigrin/sinalbin wait until you crack and wet them - only then does the isothiocyanate bomb detonate. Crack fresh, wait 10 minutes, then cook.
The molecules that make it taste like Kampot — and not like anything else.
Dry mustard is flavourless. Water triggers myrosinase, which cleaves sinigrin into allyl isothiocyanate (black/brown, pungent volatile - attacks the nose) or sinalbin into p-hydroxybenzyl isothiocyanate (yellow/white, non-volatile - lingers on the tongue). That chemistry separates Dijon from ballpark yellow.
0.5-2%
Sinigrin (B. juncea)
dry seed, glucosinolate precursor
1-3%
Sinalbin (S. alba)
dry seed, yellow-mustard precursor
10 min
Hydrolysis window
full ITC release after crushing in water
65 C
Enzyme kill
heat above this stops further heat development
Sharp, volatile, nose-burning - Dijon heat.
Non-volatile, tongue-lingering yellow heat.
Tasteless precursor in brown seed.
Tasteless precursor in yellow seed.
Carrier, body in prepared mustards.
Thickens water-mustard slurries.
| Pepper | ITC | Oil |
|---|---|---|
★ Brown mustard (B. juncea) Dijon and Indian kitchens - pungent volatile | AITC 45% | 1.5% |
Yellow mustard (S. alba) American ballpark - mild, lingering | pHBITC 25% | 1.0% |
Black mustard (B. nigra) Traditional European - rare now, shatters badly | AITC 50% | 1.8% |
Horseradish (for contrast) Same ITC, fresh root only | AITC ~100% | 0.5% |
Wasabi (for contrast) Related ITC, volatile and unstable | 6-MITC | trace |
Beaune, Bourgogne · est. 1840
“The last independent Dijon mustard house — since 1840, Edmond Fallot is one of only two producers still milling mustard seed on Burgundy millstones, and a founding member of the Moutarde de Bourgogne IGP that brought the brown seed back to French soil.”
MethodsBrassica juncea brown seed grown by 80 Burgundy families on HVE protocol, delivered whole and cleaned at Beaune; stonegrinding on basalt-granite millstones below 50 °C to preserve sinigrin; maturation in oak vats; cold-filled into stoneware pots; zero preservatives in the IGP line.
How the world cooks with it.
3 signature dishes
Dijon PGI demands brown mustard (B. juncea) milled with verjuice or white wine. Since 1937, the name protects a method: fine grind, controlled hydrolysis, no turmeric. The heat is sharp, volatile, Burgundian.
Rabbit braised with Dijon, cream and tarragon - the bistro classic.
One teaspoon Dijon emulsifies three tablespoons oil with one of vinegar.
Brive's grape-must mustard, darker and sweeter than Dijon.
What it's called, from Phnom Penh to Palermo.
بذور الخردل
budhur al-khardal
芥菜籽
jie cai zi
Mustard Seed
Graines de moutarde
Senfsamen
राई
rai
Semi di senape
マスタードシード
masutaado shiido
Sementes de mostarda
Semillas de mostaza
Protein
Plant
Three commercial species. Yellow/white (Sinapis alba) - mild, turmeric-less American-style. Brown (Brassica juncea) - the Dijon and Indian kitchen default, pungent and volatile. Black (Brassica nigra) - traditional, hottest, now rarely farmed because the pods shatter at the slightest touch.
Sources