The French have known this forever, whereas here, in the beautiful States, it just became the next big thing: There is nothing more wonderful you can do to potatoes than to cook them in duck fat. Where do I get duck fat, you ask? Cook a single Moulard duck breast half, and you'll easily render off a cup and a half. Strain out the brown bits, and you can store the fat almost indefinitely in the refrigerator. And don't feel guilty — you're using only a tiny bit.
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