Non-traditional ways of cooking?

This can be either in the cooking board or the cookware board. I was reading about the “Wonderbag” as a way of cooking with no active fuel supply because I was trying to see if there is a way for the food to start cooking itself in the morning so its ready in the evening. In the end, I didn’t get the invention because I was worried, in my case, about temperature dropping too low by the time i come back and encourage bacterial growth, and mushy food texture from being in a stew for too long since the time of cooking is somewhat fixed (fixed by the number of hours spent at work, that is)

But that gets me thinking, have any of you tried non-traditional ways of cooking? Non-traditional in the sense that its not as commonly discussed here, that is. I am sure some of these ways of cooking are traditional somewhere else.

“Food is a pretty good prism through which to view humanity.”

― Jonathan Gold