Mycoprotein is a food made by continuous fermentation of the fungus, Fusarium gramineurum. The fungus is grown in a large fermentation tower to which oxygen, nitrogen, glucose, minerals, and vitamins are continually added. After harvesting, the fungus is heat treated to reduce its RNA content to World Health Organisation recommended levels before being filtered and drained. So basically, it`s fermented fungus which is then heat treated to make it resemble meat Why do vegetarians want anything they`re eating to resemble meat anyway?