Suehiro Sake Brewery in Aizu, Fukushima Prefecture, is one of the largest and most famous sake producers in the Tohoku Region. Founded in 1850, it has been a family owned business for seven generations. Suehiro was the first sake brewery to introduce the “Yamahai” method, where sake yeast is produced using lactic acid and microorganisms naturally present in the air, allowing fermentation to occur.