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"Increase heat to medium. As the milk heats up, the sauce will thicken. Stir regularly at first, then constantly as it thickens. Once the Sauce is thick enough to coat the back of the wooden spoon (test: draw a path with finger, if it stays, it's thick enough, see photo below), remove from stove immediately."
<https://japan.recipetineats.com/chicken-macaroni-gratin/comment-page-1/>