Food Network Star Guy Fieri will introduce a brand new full-service barbecue venue aboard Carnival Horizon when it debuts in spring 2018. The celebrity chef already has his namesake burger joints on 19 Carnival Cruise Line ships.  An expansion of Fieri’s casual barbecue eateries on several Carnival ships, Guy’s Pig & Anchor Bar-B-Que Smokehouse|Brewhouse will showcase authentic, down-home smoked-on-board barbecue and …