
Crispy roast potatoes sound simple, but achieving that shatteringly crunchy exterior with a fluffy, steamy center is genuinely one of cooking's great pleasures — and this method nails it every time. The trick is a two-step process: par-boiling the chunks until their edges go ragged, then roughing them up in the pot so every surface is primed to crisp in the hot fat. Duck fat, goose fat, or beef tallow each bring a deep, savory richness that olive oil simply can't match, though all four options are naturally free of any processed sweeteners or additives. Every single ingredient here is whole and straightforward — potatoes, fat, salt, pepper, garlic, and fresh herbs — so there's nothing hidden to worry about. Avoiding high fructose corn syrup in savory dishes can be trickier than it sounds, since many store-bought seasonings, sauces, and even flavored oils sneak it in, but this recipe sidesteps all of that by keeping things completely from scratch. Optional rosemary or thyme tucked alongside the potatoes perfumes the whole pan as they roast, adding an herby, aromatic note that feels almost effortlessly elegant. These are the kind of potatoes that disappear from the serving dish before you've even sat down.
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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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