They're caught with nets, force-fed with grain, drowned in Armagnac, seasoned, and then cooked in their own fat. When you eat one, you hold onto its head and place it feet-first into your mouth, all while wearing a towel or napkin on your head to "shield from God's eyes the shame of such a decadent and disgraceful act" [0].
0: https://web.archive.org/web/20210303221803/https://www.teleg...