Dutch Oven alternative for campfire?
Another alternative is:


Dig a hole the size of a dutch oven
Fold a liner for the hole out of several layers of foil
Remove the foil liner
Put hot coals in the bottom of the hole
Put the foil liner over the coals
Add the food
Cover the food with foil
Add more coals on top if you need them


The earth around the foil liner holds heat much like the dutch oven pot would. Re-fill the hole when you are done, taking care to put the sod back intact, and the environmental impact is minimal.