Flat, open shaped mushrooms that are picked after they blooms. Between 42-75mm, they are larger than Donko Shiitake but thinner, so quicker to rehydrate. Our premium dried Shiitake Mushrooms are naturally cultivated on special oak logs in the forests of Kyushu, a Southern Island of Japan. These Koshin Shiitake are organic, forest-grown and dehydrated to a moisture content of less than 9% for maximum umami impact. This special growing process gives these mushrooms a deep and unique flavour that compliments their outstanding firm texture. The Ultimate Umami Booster: while Glutamate and Inosinate are widely recognised as Umami-boosters, the chemical reaction that occurs when you rehydrate these mushrooms produces enough Guanylate to intensify the Glutamate Umami by around 7-8 times – that’s a big difference on the palate.