A variation on the rock boil.
If you haven’t planned ahead to bring a canteen cup or other metal cooking pot, one of the best improvised cooking methods is the “rock boil.”
Scrape a depression in the ground. Line it, flesh-up, with the hide of an animal you have snared and plan to eat.
Put your stew ingredients in the hide with water to cover. Carefully add one or two hot rocks you have heated in your came fire. As one rock cools down and stops simmering, fork it out with a stick, put it back in the fire, then replace it with another hot rock. Primitive peoples who do this a lot keep a dozen or so chicken egg-sized rocks for this purpose and use them in continuous rotation.
To poach small palm-sized fish or boned fillets takes three to four egg or lemon-sized rocks to a quart of water in mild shirt-sleeve weather. Double that cooking time for chilly weather and for red meats. Cutting game meat into smaller 2cm bite-sized pieces speeds cooking time. Smash the bones and marrow into a paste and put that into your cooking skin too.
Punch holes at 2 inch intervals around the edges of the cooking skin, and thread with cordage, so that you can gather up any leftovers into the bag and hoist high enough into a tree to protect your stash from predators. If on the move this enables you to carry your food with you.
Search also for "Wonder Oven"
http://preparednessadvice.com/cooking/wo...must-have/
http://preparednessadvice.com/recipes/wo...ng-grains/