Karashi
Karashi (芥子, 辛子, からし, or カラシ) 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. Karashi is usually sold in powder form or paste form in tubes. Karashi in powder form is prepared for use by mixing with lukewarm water to a paste and leaving it covered for a few minutes.
Karashi is often served with tonkatsu, oden, natto, and shumai.[1] Karashi can be used as part of a dipping sauce when mixed with mayonnaise, called "karashi mayonnaise" or with vinegar and miso, called karashi su miso. It is also used to make karashinasu, pickled japanese eggplant (茄子).