UNIONDALE - ? There is a hot battle going on this morning between Long Island firehouses and their chefs. The Nassau County Firefighters Museum and Education Center is hosting a Firefighter Grilling Throwdown at the Firefighters Museum. Teams of the self-proclaimed best firehouse chefs are going head-to-head in a sizzling competition while reminding Long Islanders of barbecue and cooking safety. Nassau County Executive Ed Mangano and Angelo Catalano, board president of the museum, are among the judges.The firefighter teams include Elmont, Rockville Centre, Bethpage and Syosset volunteers.