This is a second hand story from a cousin of mine that was a Marine stationed in Panama way back when we were taking down Noreaga:
He said they would see villagers outside of town living in small huts and such that would start up communal fires at night. They would wrap taters in some sort of large leave which he believed to be banana leaves, kinda like you would wrap a tortilla (start wrapping, fold in the edges, then wrap the rest of the way). They would then secure it with plant stems or vines it looked like before tossing in the edges of the fire. Every so often they would 'turn' em, and do this until the leaves had completely steamed out and turned brittle and were falling away, then pull them out, let me cool, and eat as is.
Sounded interesting...