
Crispy on the outside, fluffy and steaming on the inside — these roast potatoes are the kind of side dish that disappears from the table before anything else. The technique here is what sets them apart: par-boiling the chunks until the edges turn ragged, then shaking them dry in the pot to rough up the surface, creates that signature shaggy coating that crisps up beautifully in the oven. Hot fat on a preheated baking sheet means every piece sizzles on contact, locking in that golden crunch from the very first second. For anyone managing fructose sensitivity, this recipe is a genuinely satisfying win — potatoes are naturally low in fructose, and every ingredient here is straightforward and clean with no hidden sugars or problematic additions to navigate. Duck fat, goose fat, or beef tallow each bring a rich, savory depth that olive oil can't quite match, though all four options work wonderfully. The optional garlic cloves are left unpeeled and simply crushed, so they perfume the pan without releasing the concentrated fructose load that minced or roasted garlic can carry. Season generously with flaky sea salt the moment they come out of the oven, and serve immediately while that crust is still crackling.
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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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