These Chinese meat-stuff steamed buns are called nikuman in Japan and butaman in Osaka. "-man" is a short for manto/manju which meant bun. Niku is meat. Buta is pig and in China, meat is pig, or they would settle for anything else, but that should be pork. Panda is meat too.
I don't make my butamans because I can't get any as in Osaka they sell them at every corner of street.