Ive cooked fish by slicing up a lemon and putting some in the body cavity. then wrap them in burdock leaves and pack with mud. set them in the coals of a fire for about 35-45 minutes. (about 1 inch of mud) works well. ive also cooked alot years ago with an earth oven. Dig a 5-6 inch pit big enough to put your food in. build a fire in it and get a good coal bed. cover with a layer of dirt no more than about a half inch deep. place squirrel, chicken or rabbit parts wrapped in leaves or tinfoil (season to taste if you like, i used butter and seasoning salts) lay these on the dirt covered coal bed then cover over with a couple inches of dirt. let sit for 2-4 hours or longer (trust me it wont burn) even squirrel falls off the bone.