Crossword Genius

Potatoes au ___ (6)

Ross

I believe the answer is:

gratin

(Other definitions for gratin that I've seen before include "A dish cooked with grated cheese on it" , "Grated cheese or breadcrumbs on a dish" , "'Au ..., with a cheesy topping (6)'" , "With a crisp, golden topping" , "Cooked covered in grated cheese or breadcrumbs" .)

I've seen this clue in The Washington Post.
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