braise vs gratin

braise

noun
  • A dish (usually meat) prepared by braising. 

  • A sauce used for braising. 

  • Pagellus bogaraveo, syn. Pagellus centrodontus (sea bream) 

verb
  • To cook in a small amount of liquid, in a covered pan, somewhere between steaming and boiling. 

gratin

noun
  • The top crust of a dish, consisting of breadcrumbs or grated cheese heated under a grill; the dish itself. 

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