I presume the GP is talking about air poppers: http://en.wikipedia.org/wiki/Air_popper http://en.wikipedia.org/wiki/Air_popper Basically, they funnel heated ai

I presume the GP is talking about air poppers: http://en.wikipedia.org/wiki/Air_popper http://en.wikipedia.org/wiki/Air_popper Basically, they funnel heated air into a small chamber. My girlfriend's dad uses his to roast coffee and swears by it. I don't drink coffee myself (can't stand the smell) so I can't give an opinion.