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

plural of gratin

(transitive, intransitive, cooking) To bake so as to form a gratin.

simple past tense and past participle of gratinate

present participle of gratinate

Third-person singular simple present indicative form of gratinate

(cooking) Covered with a crust of breadcrumbs (and often cheese) then browned under a grill.