It might not be the prettiest food on earth, but foie gras is one of the most famous, luxurious French delicacies in the world. Made of fattened-up duck or goose liver, it's one of those foods that you either love or hate. However, the force feeding technique used to produce foie gras (known as gavage), is highly controversial and unaccepted in many countries. Rich in calories, it can be prepared in many ways, cooked or fresh, as an appetizer or an accompaniment to certain dishes.