gratinee

/G R EY1 T AH0 N IY1/
noun
  1. 1

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

Source: https://en.wiktionary.org/wiki/gratin, https://en.wiktionary.org/wiki/gratin%C3%A9e, https://en.wiktionary.org/wiki/gratinee