I made barbacoa in my kitchen. More for the experience and the photo opportunity than anything else. The cost after buying the pot and all ingredients was $1000 pesos, about $80 US dollars. I had 3 tacos, $26 per taco, then I gave the rest away to the maids.
Roasting the Maguey (Agave) leaves.
The lamb drippings will form a consomme with the vegetables.
Coat with a chile marinade.
After placing the lamb on the grill, the leaves are folded down to cover the meat.
The pot is covered and the top sealed with corn masa (dough).