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Wasabi (Wasabia Japonica)
A plant resembling watercress and growing naturally in Japan by mountain streams - it's also known as 'mountain hollyhock' and in Britain as 'Japanese horseradish'. Its roots are used to make a paste (like a pale-green horseradish sauce) to accompany sushi, this is available ready-prepared in specialist shops in the UK, but the actual wasabi content and the quality of the product doesn"t approach that served in restaurants in Japan and the home-made variety.
It's probably better to buy wasabi as a powder and mix it to a paste with water (in a similar style to English mustard) - it will keep its flavour much longer. See also "Japan; food in"