Vargo's Fire Box Grill allows you to grill food using wood as your fuel, its simple to setup and packs flat into a pouch for clean and convenient storage.
Vargo says:
Get grillin’ in the backcountry without charring the Earth or weighing down your pack! The Vargo Fire Box Grill features a hinged grate and panel system for easy setup, fold-flat packing, and fire preparation.
Just lift the grate and add your fuel. Titanium tent stake skewered kebabs, anyone?
Vargo's Fire Box Grill is a mini marvel, all the parts are joined together with hinges so its just a matter of unfolding and refolding to get it set up. Its not massive, you'd get about 4 sausages or 2 burgers on it, and the fuel box will need to be topped up quite regularly.
BUT.., we like it because there isn't anything else that will grill stuff that's anywhere near as light or convenient. When folded flat it slots into a velcro pouch that will keep the soot in check.