Barbacoa is not a method of grilling something over an open flame. Traditional Mexican barbacoa is completely different. It is a method of cooking with vapor/steam and results in a moist and flavorful meat. The meat is marinated then slow cooked in a pit and is very tender.These days many cook the barbacoa in an oven. I cooked my barbacoa in a 5 gal/20 liter pot. After adding a liter of water a small grill is placed in the pot then on the grill a casserole with vegetables. Another small grill is placed over the casserole and the meat is wrapped in the maguey leaves. The lid on the pot was sealed with corn tortilla masa. Once the water began to boil the flame was reduced and the meat cooked for 8 hours.