Greening Goat's Foot Mushroom
From Shadow of the Throne Wiki
A small, shriveled mushroom which shifts from white to green as it ages. It is known to have medicinal properties in improving eyesight and relieving strain on the eyes, though improperly prepared it has a foul and potent flavour.
While the nobles of the Scarlet Dynasty and Patrician Clans can enjoy subtle treatments derived from the Greening Goat's Foot which avoid such foulness, the Apricot Ministry mixes a tea for distribution to the peasants of the Blessed Isle with the mass production methods meaning a decidedly unpleasant experience.