Kykeon (Ancient Greek: κυκεών, kykeȏn; from κυκάω, kykáō; "to stir, to mix") was an Ancient Greek drink of various descriptions. Some were made mainly of water, barley and naturally occurring substances. Others were made with wine and grated cheese.[1] It is widely believed that kykeon usually refers to a psychoactive compounded brew, as in the case of the Eleusinian Mysteries.[2] A kykeon was used at the climax of the Eleusinian Mysteries to break a sacred fast, but it is also mentioned as a favourite drink of Greek peasants.