au gratin

adjective
🔊/əʊ ˈɡrætæn/
🔊/əʊ ˈɡrætn/
[usually before noun] (from French)
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  1. covered in breadcrumbs or cheese and made brown by heating in an oven, etc.
    Word OriginFrench, literally ‘by grating’, from the verb gratter ‘to grate’.