Wasabi (わさび（山葵）, originally 和佐比; Wasabia japonica or Eutrema japonica), is a member of the Brassicaceae family, which includes cabbages, horseradish, and mustard. It is also called Japanese horseradish, although horseradish is a different plant (which is often used as a substitute for wasabi). Its root is used as a condiment and has an extremely strong flavor. Its hotness is more akin to that of a hot mustard than that of the capsaicin in a chili pepper, producing vapours that stimulate the nasal passages more than the tongue. The plant grows naturally along stream beds in mountain river valleys in Japan. The two main cultivars in the marketplace are W. japonica 'Daruma' and 'Mazuma', but there are many others.
Wasabi is generally sold either as a root which is very finely grated before use, as dried powder in large quantities, or as a ready-to-use paste in tubes similar to travel toothpaste tubes. In some restaurants, the paste is prepared when the customer orders, and is made using a grater to grate the root; once the paste is prepared, it loses flavour in 15 minutes if left uncovered. In sushi preparation, sushi chefs usually put the wasabi between the fish and the rice because covering wasabi until served preserves its flavor.
Fresh wasabi leaves can be eaten, having the spicy flavor of wasabi roots.
Because the burning sensations of wasabi are not oil-based, they are short-lived compared to the effects of chili peppers, and are washed away with more food or liquid. The sensation is felt primarily in the nasal passage and can be quite painful depending on the amount consumed.
Legumes (peanuts, soybeans, or peas) may be roasted or fried, then coated with wasabi powder mixed with sugar, salt, or oil and eaten as a crunchy snack. Inhaling or sniffing wasabi vapor has an effect like smelling salts, a property exploited by researchers attempting to create a smoke alarm for the deaf. One deaf subject participating in a test of the prototype awoke within 10 seconds of wasabi vapor being sprayed into his sleeping chamber. The 2011 Ig Nobel Prize in Chemistry was awarded to the researchers for determining the ideal density of airborne wasabi to wake people in event of an emergency.
Wasabi is difficult to cultivate, and that makes it quite expensive. Due to its high cost, a common substitute is a mixture of horseradish, mustard, starch and green food coloring. Outside of Japan, it is rare to find real wasabi plants. Often packages are labeled as wasabi, but the ingredients do not actually include wasabi plant. Although the taste is similar between wasabi and horseradish, they are easily distinguished[clarification needed]. In Japan, horseradish is referred to as seiyō wasabi (西洋わさび?, "western wasabi"). In the United States, true wasabi is generally found only at specialty grocers and high-end restaurants.
The chemical in wasabi that provides for its initial pungency is the volatile allyl isothiocyanate, which is produced by hydrolysis of natural rhizome thioglucosides (conjugates of the sugar glucose, and sulfur-containing organic compounds); the hydrolysis reaction is catalyzed by myrosinase and occurs when the enzyme is released on cell rupture caused by maceration — e.g., grating — of the plant's rhizome.
The unique flavor of wasabi is a result of complex chemical mixtures from the broken cells of the rhizome, including those resulting from the hydrolysis of thioglucosides into glucose and methylthioalkyl isothiocyanates:
- 6-methylthiohexyl isothiocyanate,
- 7-methylthioheptyl isothiocyanate, and
- 8-methylthiooctyl isothiocyanate.
Nutritional information 
100g of wasabi root contains:
- Calories : 109
- Fat: 0.63 g
- Carbohydrates: 23 g
- Fibre: 7.8 g
- Protein: 4.8 g
Few places are suitable for large-scale wasabi cultivation, and cultivation is difficult even in ideal conditions. In Japan, wasabi is cultivated mainly in these regions:
|Prefecture||Cultivated in water||Cultivated in soil||Total|
There are also numerous artificially cultivated facilities as far north as Hokkaidō and as far south as Kyūshū. As the demand for real wasabi is very high, Japan has to import a large amount of it from China, Ali Mountain of Taiwan, and New Zealand.
In North America, a handful of companies and small farmers are successfully pursuing the trend by cultivating Wasabia japonica.
Wasabi is often grated with a metal oroshigane, but some prefer to use a more traditional tool made of dried sharkskin with fine skin on one side and coarse skin on the other. A hand-made grater with irregular teeth can also be used. If a shark-skin grater is unavailable, ceramic is usually preferred.
The two kanji characters "山" and "葵" do not correspond to their pronunciation: as such it is an example of gikun (meaning, not sound). The two characters actually refer to the mountain Asarum, as the plant's leaves resemble those of a member of Asarum species, in addition to its ability to grow on shady hillsides. The word, in the form 和佐比, appeared in 918 in The Japanese Names of Medical Herbs (本草和名 Honzō Wamyō). Written in this way, the particular kanji are used for their phonetic values only, known as ateji (sound, not meaning — opposite of gikun).
- "Eutrema japonica (Miq.) Koidz.". Germplasm Resources Information Network, USDA.
- "Wasabia japonica". MULTILINGUAL MULTISCRIPT PLANT NAME DATABASE, The University of Melbourne.
- Growing Edge (2005). the Best Of Growing Edge International 2000-2005. New Moon Publishing. p. 57. ISBN 978-0-944557-05-1.
- Lowry, Dave (2005). The connoisseur's guide to sushi: everything you need to know about sushi. The Harvard Common Press. p. 205. ISBN 1-55832-307-4.
- What's That Stuff? Wasabi | Science & Technology | Chemical & Engineering News
- Levenstein, Steve. "Wasabi Silent Fire Alarm Alerts the Deaf with the Power of Scent". InvestorSpot.
- The Sushi FAQ - Sushi Items - Wasabi
- "CONDIMENTS — Wasabi: real vs. fake".
- Ina, K., Ina, H., Ueda, M., Yagi, A. and Kishima, I., 1989. ω-methyl thioalkyl isothiocyanate, in wasabi. Agric. Biol. Chem. 53, pp. 537–538.
- H. Masuda, Y. Harada, K. Tanaka, M. Nakajima, and H. Tabeta, 1996, Characteristic Odorants of Wasabi (Wasabia japonica matum), Japanese Horseradish, in Comparison with Those of Horseradish (Armoracia rusticana), Biotechnology for Improved Foods and Flavors, Ch. 6, ACS Symposium Series, Vol. 637, pp 67–78.
- www.freshwasabi.com/tech.aspx; accessed 11 February 2011.
- Ina et al. 1989, ibid.
- Masuda et al. 1996, ibid.
- Arnaud, Celia Henry. What's That Stuff? Wasabi. Chemical and Engineering News, Vol. 88, No. 12 (March 22, 2010), p. 48
- Zeuthen, P.; Bøgh-Sørensen, Leif (2003). Food preservation techniques. Woodhead Publishing Limited. p. 12. ISBN 978-1-85573-530-9.
- NDL/FNIC Food Composition Database Home Page
- "(title in Japanese)" [Wasabi (Production)] (in Japanese). Portal Site of Official Statistics of Japan.
- Andoh, Elizabeth; Beisch, Leigh (2005). Washoku: recipes from the Japanese home kitchen. Ten Speed Press. p. 71. ISBN 978-1-58008-519-9.
Further reading 
- Shin IS, Masuda H, Naohide K (August 2004). "Bactericidal activity of wasabi (Wasabia japonica) against Helicobacter pylori". Int. J. Food Microbiol. 94 (3): 255–61. doi:10.1016/S0168-1605(03)00297-6. PMID 15246236.
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- Wasabi Information — Purdue University Agriculture
- Wasabi (Wasabia japonica (Miq.) Matsum.) — Spice Pages