No New Zealand Food Blog could not mention the Hangi.
The Hangi is made by placing food in a pit filled with hot rocks. The food is covered in tin foil trays (these days) - or covered in bark and large leaves - or sacking. This is to prevent burning of the food.
Apparently the type of rock is important - as some rocks shatter in the heat (something you don't want).
For a comprehensive guide see http://www.maorifood.com/hangi.htm