The chain recently welcomed back its Cajun Flounder Sandwich. Now available at Popeyes locations nationwide, the Cajun Flounder Sandwich begins with the main component: flounder. Sourced from the Pacific Ocean, the flounder filet light, flakey and seasoned in a blend of Cajun classic and spicy seasoning. It is fried and topped with barrel-cured pickles and tartar sauce and served on a buttery toasted brioche bun. This year, though, the annual fish sandwich offering comes in two varieties, with guests able to choose from classic or spicy.