
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 secret is a two-step process: parboiling the chunks until their edges turn ragged, then shaking them in the pot to rough up the surface before they hit a screaming-hot pan of fat. That shaggy, textured exterior is what crisps up so dramatically in the oven, creating a golden crust that audibly crunches when you bite in. For anyone avoiding carrageenan, this recipe is refreshingly straightforward — every ingredient is whole and unprocessed, with no emulsifiers, stabilizers, or thickeners anywhere in sight. Duck fat, goose fat, beef tallow, or a good olive oil all work beautifully here, and none carry the additive concerns that can sneak into processed cooking sprays or store-bought seasoning blends. Optional garlic cloves and fresh rosemary or thyme add an aromatic depth that makes the whole kitchen smell incredible as they roast. 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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