Popeyes' new fish sandwich is a muted sequel to the chicken sandwich blockbuster of 2019 Emily Heil, The Washington Post Feb. 12, 2021 FacebookTwitterEmail 2of3Popeyes' new Cajun Flounder Sandwich.Washington Post photo by Emily HeilShow MoreShow Less 3of3 Formulas often work. See: blockbuster superhero movies, the latest Taylor Swift bop or an Alex Cross novel (spoiler: the bad guy gets it in the end). That's what Popeyes is counting on with its latest menu item, a fried flounder sandwich with a touch of Cajun seasoning. The chicken chain is clearly keen to re-create the market-altering, viral sensation that was the spicy chicken sandwich it debuted in 2019 as a clapback to Chick-fil-A's soaring popularity. The much-Instagrammed bird famously sold out, eventually was restocked, and put pressure on fast-food rivals to take up arms (er, wings) in what came to be known as the Great Chicken Sandwich Wars.