A variation of this delicacy is Foie Gras, which is probably the most controversial paste around. Why? It involves force feeding ducks or geese for a period of time to ensure a rich liver. During this time, the animals are constrained in small boxes and force fed by a tube known as a ‘gavage’. French law states “"Foie gras belongs to the protected cultural and gastronomical heritage of France,” but animal rights activists call the practice cruel and outdated.