Karashi Mustard Japanese Hot Variety

Japan — karashi imported from China ancient period; widespread use documented Heian period; tube karashi commercially produced Meiji period

Karashi (芥子/からし, Japanese mustard) is Japan's primary hot mustard — made from ground brown/oriental mustard seeds (Brassica juncea) without vinegar, producing an explosive sinus-clearing heat quite different from European prepared mustards. Unlike Western dijon or yellow mustard (which use vinegar to moderate heat), karashi is mixed with warm water alone — activating myrosinase enzyme that converts sinigrin to allyl isothiocyanate (the same compound in wasabi). The heat peaks within 5-10 minutes of mixing and dissipates over 30 minutes. Classic Japanese applications: served with oden, natto, tonkatsu, and dengaku. Prepared tubes (pre-mixed with water) are convenient but less intense than fresh-mixed powder.

Pure sinus-clearing allyl isothiocyanate heat without vinegar moderation — instantly powerful, briefly maintained, cleanly dissipating