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"I know it's a very popular breakfast, so I think so.  You can just duck into any 7/11 equivalent in the morning and get two piping hot sticky rice &amp; pork belly shumai in a cheap thin plastic mini bag for less than a dollar.   And it's one of the few things I can think of where the cheaper versions seem better than the expensive ones.  \n  \nBut there are some things that are now so universally served across China that's it hard to guess who it belongs to without some extra effort.   Red Roasted Pork Belly would seem to be very much a local thing until you're told it's from Hunan.  Or Chengdu.  Or whoever else claims it as theirs - it's served at almost every restaurant regardless of their actual source region.   The breakfast pancakes (jian bing) are also somewhat ubiquitous and popular, and depending on who you ask, or what variation you get, could be from one place or another.   \n  \nSo I wouldn't be surprised if they are Shanghainese. \n"
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