A great source for campfire cooking equipment, instructional videos, and cookbook is yalleatyet.com, by my friend Johnny Nix. You can see his shows on how to cook over a wood fire, and a fireplace (coming in March on Rural TV and later on RFD TV). He was on Campfire Cooking on RFD until 2006, and now has a show, Cooking Outdoors, on RFD TV and on Rural TV. Good Luck!
