Foie gras (Listeni/ˌfwɑːˈɡrɑː/, French for "fat liver") is a luxury food product made of the liver of a duck or goose that has been specially fattened. By French law,[1] foie gras is defined as the liver of a duck or goose fattened by force-feeding corn with a feeding tube, a process also known as gavage. In Spain[2] and other countries outside of France it is occasionally produced using natural feeding.[3] Ducks are force-fed twice a day for 12.5 days and geese three times a day for around 17 days. Ducks are typically slaughtered at 100 days and geese at 112 days.[4]