There is a Chinese congee called "La Ba Zhou" consumed on a specific holiday ("La Ba") that supposedly originated from a poor family that didn't have enough of a single grain to make congee for the holiday. So they made a congee with a bunch of different grains in order to have enough for the whole family. And it ended up tasting really good and now everyone makes it on that day.
I'm convinced that a lot of today's popular dishes were created this way
There is a Chinese congee called "La Ba Zhou" consumed on a specific holiday ("La Ba") that supposedly originated from a poor family that didn't have enough of a single grain to make congee for the holiday. So they made a congee with a bunch of different grains in order to have enough for the whole family. And it ended up tasting really good and now everyone makes it on that day.