hangi vs shish kebab

hangi

noun
  • Food cooked in this way. 

  • A traditional Māori method of cooking food using heated rocks buried in a pit oven. 

shish kebab

noun
  • A dish made of small pieces of meat, with or without vegetables, which are skewered on a wooden or metal stick and roasted in an oven or over an open fire. 

  • A crystal structure consisting of a central spine (the shish) and disks or lumps growing out from it (the kebab). 

How often have the words hangi and shish kebab occurred in a corpus of books? (source: Google Ngram Viewer )