Yellow mustard and black mustard come from different plants. Yellow mustard seed is larger, pale and milder. Black and brown mustard seed is smaller, darker and sharper in flavour.
Most mustard grown in India is Brassica juncea, often called brown or Indian mustard. In the trade, small dark Indian seed is frequently sold as black mustard, so check which species you are being offered.
The three main types
- Yellow or white mustard (Sinapis alba): larger, pale yellow seed with a mild heat. Widely used in prepared mustards and as a food ingredient in North America and Europe.
- Brown or Indian mustard (Brassica juncea): small, reddish brown to dark seed with a strong, pungent flavour. India's main mustard crop, used in cooking, pickles and for oil.
- Black mustard (Brassica nigra): small, very dark seed, the most pungent. Grown less now in many places, partly because it is harder to harvest by machine.
Why the flavour differs
Mustard heat comes from compounds released when the seed is crushed and mixed with water. Brown and black mustard produce a sharp, volatile heat that reaches the nose. Yellow mustard produces a milder heat that stays on the tongue.
So swapping one type for another changes the taste of your product. Check with your production team before changing.
Mustard in India
India grows mustard mainly as a winter oilseed crop, with Rajasthan the largest producer, and Madhya Pradesh, Uttar Pradesh, Haryana and Gujarat also important. Much of the crop is crushed for oil at home. Some yellow-seeded types are also grown in India, mainly for oil, but they are not the same as Sinapis alba.
For export, small brown and dark seed is traded for Indian cooking, pickles and spice blends. Ask the supplier for the botanical name on the specification.
If your product needs true yellow mustard of the Sinapis alba type, India is usually not the main origin. Ask whether the supplier can offer it at all before you compare quotes, because a yellow-seeded Indian type will not behave the same in your recipe.
What to check
- Species and colour, against an approved sample.
- Purity and admixture, including seeds of other plants.
- Moisture, as an oil-bearing seed can go rancid if stored damp.
- Pesticide residues against your market's limits.
- No ethylene oxide treatment, for the EU and many other markets.
- Allergen labelling: mustard is a listed allergen in the EU, the UK and some other countries, so label it correctly.
Our guides on declaring allergens like mustard and celery and admixture and how much is acceptable give more detail.
How we help
We confirm the species and grade of mustard seed before you book, compare samples from several processors and have them tested at NABL-accredited labs. To source mustard seed, start with a free sourcing review.