Kykeon
From BurnZero
Kykeon (Ancient Greek: κυκεών, kykeȏn; from κυκάω, "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].