Brassica juncea
Karashi is a type of mustard used as a condiment or as a seasoning in Japanese cuisine. Karashi is made from the crushed seeds of "Brassica juncea", frequently mixed with wasabi or horseradish to add zest. Karashi is not usually sweetened nor thinned with a liquid. However, it can be used as part of a dipping sauce when mixed with mayonnaise or ketchup.