our way is a lil different...need a sandy area..
basically, in hawaii, we dig a hole on the beach, make a bond fire...get the coals good and deep...cover the coal with wet burlap sacks, put the pig in, cover pig with wet burlap sacks, no foil...throw in anything else ya want too...in with the pig between the burlap....totally fill the hole with sand...
later that night

http://z.about.com/d/gohawaii/1/0/l/...lagoon_008.jpg

can use your hand and get a fistful anywhere on the hog...and is very evenly cooked.