Fermentation

The forgotten pot
''One day, a Porco left a few leftover grains in a pot outside of his hut. Forgotten, they remained there for days under the rain. Later, while cleaning stuff around his hut, the Porco happened to cover the pot by stacking other baskets on top of it without noticing it's content. When he eventually rediscovered the pot, from its content came a strange somewhat appealing smell. Curious by nature, the hog tasted the drink and felt funny afterwords.''

Potential Requirements

 * Agriculture appears to be a prerequisite.