A while ago we tried to cook a whole lamb in a fire pit. Basically we dug a pit about 2-2.5 feet deep, lined it with rocks to try and retain the heat, made a large fire in it, and started to drink. Then when the fire had died down a bit we lined the fire with some damp straw, put in the hessian wrapped lamb, put more damp straw on top then covered the whole thing with earth and left for 24 hours.
When we dug it up, the lamb was done beautifully on the fire side, but raw on the top.
What might we have done wrong, apart from getting drunk whilst the fire was burning? Has anyone done this before and what are the things that we should bear in mind if we do it again?