Never seen a vatrushka with onions in my life and I'm pretty sure no one I know would ever call a pastry with onions a "vatrushka". It's all about quark and rai

Never seen a vatrushka with onions in my life and I'm pretty sure no one I know would ever call a pastry with onions a "vatrushka". It's all about quark and raisins, even a round shape doesn't really matter that much anymore. I mean, show that onion-filled open-top pastry thing to about anyone Russian-born — they'll just say it's some kind of "пирожок", hardly anybody would call it a vatrushka. Show them that specific oven-cooked quark-and-raisins dish of any form — they'll most likely say it's a vatrushka. So, by definition of a language — it kinda is. By the way, onions are not mentioned neither in Russian or Ukrainian wiki-pages.