CHICAGO - Five months after the city ordered restaurants to stop selling foie gras, it's liver and let liver in Chicago. While some fancy restaurants and gourmet shops no longer offer the goose or duck liver delicacy, others are flouting the ban, listing foie gras on their menus and, in one case, framing the city's warning letter. Evoking Chicago's Prohibition-era past, when a password could gain entry into a speakeasy, at least one restaurant is rumored to be serving foie gras to customers who ask for the "special lobster" dish. And one place has cleverly skirted the ban by offering...