
Crispy roast potatoes are one of those side dishes that feel almost impossibly satisfying — shatteringly crunchy on the outside, fluffy and pillowy within. The trick here is a two-step process: parboiling the chunks until their edges turn ragged and shaggy, then tossing them into screaming-hot fat so they sizzle on contact and build that golden crust in the oven. Duck fat, goose fat, or beef tallow are the classic choices, and each one delivers a rich, savory depth that olive oil simply can't match — though olive oil works beautifully if that's what you have on hand. For anyone managing a nickel sensitivity, this kind of recipe is genuinely reassuring because every ingredient is straightforward and easy to verify: plain potatoes, a clean animal fat or oil, garlic, fresh herbs, and salt. There are no whole grains, legumes, or nuts hiding in the ingredient list — just honest, simple components that come together into something spectacular. Optional rosemary or thyme sprigs tucked around the pan perfume the whole tray as it roasts, making your kitchen smell like a proper Sunday dinner. These are the potatoes people ask you to bring to every gathering, and once you nail the technique, you'll never go back to a simpler method.
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Preheat the oven to 425°F (220°C). Place the fat in a large rimmed baking sheet and set it in the oven while it preheats.
Place the potato chunks in a large pot, cover with cold water by at least 1 inch, and add the kosher salt. Bring to a boil over high heat, then reduce to a vigorous simmer and cook for 10–12 minutes, until the edges are just beginning to look ragged and a knife tip meets slight resistance at the center — the potatoes should not be fully cooked through.
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