" Wine was served during the meal (rich and heavy, it was usually diluted with water), but the real drinking began once the food had been cleared away. This was the commissatio—a ceremonial drinking competition at which goblets had to be drained in a single gulp. Healths were drunk. This was the time for conversation and debate, which might last well into the evening, and was the Roman equivalent to the Greek symposium. "

― Anthony Everitt , Cicero: The Life and Times of Rome's Greatest Politician