Isshaku (traditional unit of sake volume)

Isshaku (一勺) is a traditional Japanese unit of volume for alcoholic beverages, used mainly to measure sake. One isshaku is equivalent to roughly 18.03 milliliters and is typically used as a serving amount when tasting sake. The unit is deeply rooted in Japan's food and drink culture and history, and it is often seen in settings where people enjoy sake. Because sipping sake in small amounts allows drinkers to appreciate its flavor and aroma at leisure, isshaku plays an important role in sake culture.