Pizza is probably the easiest example. Neapolitan vs. Sicilian vs. New York style vs. Chicago deep dish is quite the debate LOL. Which one is the 'real' pizza? At this point... all of them!
French fries are another; despite being seen as potentially American and/or French, depending on who you ask, their origin is actually now thought to be Belgian frites. And goulash, which another anon mentioned, is yet another example - I grew up eating the German version specifically, but there are variations all around eastern/central Europe.
Re: TorisMAO
Pizza is probably the easiest example. Neapolitan vs. Sicilian vs. New York style vs. Chicago deep dish is quite the debate LOL. Which one is the 'real' pizza? At this point... all of them!
French fries are another; despite being seen as potentially American and/or French, depending on who you ask, their origin is actually now thought to be Belgian frites. And goulash, which another anon mentioned, is yet another example - I grew up eating the German version specifically, but there are variations all around eastern/central Europe.