What type of sake is referred to as '純米酒'?

The term '純米酒' refers specifically to "pure rice sake." This classification indicates that the sake is made exclusively from rice, water, yeast, and koji mold, without the addition of distilled alcohol or any additives. The use of the term "pure" highlights the traditional methods of production and the focus on the quality of the rice used, as well as the resulting flavor profile that is often more reflective of the rice's characteristics.

Unlike other types of sake that may contain added alcohol, which can alter the flavor and aroma, pure rice sake is celebrated for its clean and genuine taste derived entirely from its natural ingredients. This category can include various grades of sake, depending on how polished the rice is before brewing, which can further influence the taste and quality. This emphasis on purity and the traditional brewing process makes '純米酒' a cornerstone of sake appreciation.