I just remembered an idea that we used to do all the time when I was a kid. We loved it. It is heavy though... hobo foil dinners!

ground beef
onion
potato
carrott
seasoning

cooked in aluminum foil in the fire

slice onions into rings. slice potatyo and carrot thin. you will make a pouch with a 12x12 piece of heavyduty aluminum foil. It will be all layered like this:

well I decided to stop describing it and just give you a link to some other sites which have many different versions and good directions:

basic instructions:
http://www.ehow.com/how_2001074_make-hobo-stew-foil-dinner-over-campfire.html

variations:
http://web.ukonline.co.uk/scoutnotebook/campcook/foil-dinner-variations.html