By Veronika Bondarenko The latest version of the signature Whopper taps into a major food trend. There have been a lot of new Whoppers in the works at Burger King lately. After a few quiet years of brand stagnation and declining revenue, the Restaurant Brands International (QSR) – Get Restaurant Brands International Inc Report-owned burger chain has experimented with products meant to both draw in large numbers of eaters and make a splash on social media. For the latter, think Whoppers topped with currywurst and fried herring, bratwurst and a nougat creme and marmalade that were all launched b…