Super efficient wood-burning rocket mass stove, but applied to cooking and not just heating the living room. One of the better designs I've been able to find so far.
Fogão a lenha sem fumaça-2
BBQ Meatball Onion Bombs Are Beyond Delicious
Don't know anything about this other than what the pic shows, but I like the look of it. Seems like it offers some fresh options for open-fire cooking. Probably have to DIY as far as obtaining that set-up, but maybe the appeal of it is enough to get someone to start making these.