Luck in the Head — M. John Harrison

This eerie and visually arresting tale is set in the grotesque city of Uroconium, where Ardwick Crome dreams of a strange ritual from his childhood. The women of his village pursue a "lamb"; to eat a pie made from its head is considered good luck. But in his dream, the living animal itself is offered to Ardwick Crome, and the gift's significance makes it too dangerous to accept...