grilled-cheese

The term is a straightforward compound of two English words, describing the preparation method and primary ingredient. 'Grill' entered English from the Old French 'graille', meaning a grating or gridiron, itself from the Latin 'craticula', a diminutive of 'cratis' (wickerwork, hurdle). 'Cheese' comes from the Old English 'cēse', via West Germanic from the Latin 'caseus'. The specific culinary concept of a 'grilled-cheese sandwich' emerged in the United States in the 1920s, coinciding with the widespread availability of sliced bread and processed cheese. It evolved from earlier toasted cheese dishes, with the name directly and transparently indicating its simple, defining characteristics: bread toasted by grilling and a filling of melted cheese.

This is a fixed compound noun. 'Grilled' is the past participle of the verb 'grill', meaning to cook by direct radiant heat. 'Cheese' is a noun for a food made from pressed milk curds. The hyphenated compound functions as a single lexical unit.