It’s how pit barbecues work as well. You heat rocks on a fire and then bury the food (like a lamb) with the rocks under the ground, using the dirt as an insulat

It’s how pit barbecues work as well. You heat rocks on a fire and then bury the food (like a lamb) with the rocks under the ground, using the dirt as an insulator. Or, cover the rocks and food (like lobster or oysters) with wet seaweed to steam the food.