I've sipped a sake, Junmai Nama Genshu, brewed by Sawaya Matsumoto. Nama genshu is stronger than usual sake. Usual sake is added water and be pasteurized, like distilled alcohols. The proof is about 18%-20%. It's not that strong, because Sake isn't distilled. This nama genshu is easy to drink and taste natural. I don't know the detail, but I like the sake like this. Roquefort went together with it too.