I LOVE cold pizza after running or biking. Or if you have a fire, pre-cook it and then just stick it in foil and re-heat.

Also good for cooking (or reheating) if you have fire but no cooking "stuff" are hobo packs (yay, Girl Scouts) - we would either let these cook for hours, or you can pre-cook meat & potatoes and then add the rest to re-heat. Essentially any meat, in small pieces, little potato chunks, and then whatever veggies you want (corn, tomato pieces, carrots, beans, broccoli, get creative) and wrap it in foil with some butter and spices, shove the foil packet into the coals/wood/bottom of the fire.