Stratton Lawrence of The Art of Manliness explains that this isn't just a way to get good roast pork. It's also "a cultural experience."
Lawrence and his friends prepared for their luau by building an imu in which to cook their whole pig. An imu is a an underground oven made with cinderblocks and dirt. Once the pig is seasoned and the wrapped and the coals burning hot, Lawrence buried the entire pit.
It's a complex process that takes days of work. But the end result is the best barbecue pork in the world. You can see more photos and read more about this Hawaiian tradition at The Art of Manliness.
-via VA Viper