I recently came across Magnolia (which seems like one of the only joints serving Southern American/Cajun/Creole food in HK). I read the Zagat's review here (seems somewhat mixed but also outdated - mainly all from 2007):
They have no listing on Openrice. Anyone been there? What was your experience like? Although I'm not from the South I'm really craving some good southern fried chicken/BBQ ribs/gumbo. Help!