The debate over the best oil for roasting potatoes crispy is one of British cooking’s great arguments, right up there with Yorkshire pudding accompaniments. Goose fat loyalists, beef dripping traditionalists, and vegetable oil pragmatists all claim victory. I’ve tested them all extensively (tough job), and the honest answer is: goose fat wins on flavour, but the method matters more than the fat. A perfect technique with vegetable oil beats sloppy technique with goose fat every time.

What Is the Best Oil for Roasting Potatoes Crispy? The Ranking

1. Goose fat (the winner): rich, savoury, with a high smoke point. Produces deeply golden, shatteringly crisp potatoes with an almost meaty depth. The traditional Christmas choice. Downside: pricey (£4–£6 a tub) and obviously not vegetarian.
2. Beef dripping (the traditionalist’s pick): incredible flavour — this is what chip shops used for a century. Crisp, beefy, magnificent. Same downsides as goose fat plus it’s harder to find now.
3. Vegetable/sunflower oil (the practical choice): neutral, high smoke point, cheap, vegan. Gets you 90% of the way to goose fat on crispness with none of the flavour. For most Sunday roasts, this is the sensible answer.
4. Olive oil (fine, with caveats): extra virgin has too low a smoke point and can taste bitter at roasting temperatures. Light olive oil is fine. Don’t waste good EVOO on roasties.
5. Coconut oil (the wildcard): high smoke point, adds a faint sweetness. Works, but the flavour isn’t traditional and it’s expensive.

What about butter?

Butter burns at roasting temperatures before the potatoes crisp — don’t roast in butter alone. But a spoonful of butter added for the last 10 minutes, along with garlic and rosemary, is a legitimate finishing move.

The Crispy Roast Potato Method (Matters More Than the Fat)

1. Use floury potatoes: Maris Piper, King Edward or Rooster. Waxy potatoes never crisp properly — same rule as [[how-do-i-make-perfect-mashed-potatoes-without-lumps|perfect mash]].
2. Parboil 8–10 minutes in salted water until the edges are just softening. Drain well.
3. Rough up the edges: shake the drained potatoes in the pan with the lid on. Those fluffy, roughed-up edges are what becomes the crispy crust — this step is non-negotiable.
4. Heat the fat first: put your fat in the roasting tray and heat in a 200°C (180°C fan) oven until shimmering and just starting to smoke. Cold fat = greasy potatoes.
5. Don’t crowd the tray: one layer, space between each potato. Overcrowding steams them. Use two trays if needed.
6. Turn once, halfway: 45–60 minutes total. Turn gently after 25–30 minutes. Season with flaky salt at the end, not the beginning (salt draws out moisture early).

The science: crispness comes from dehydrating the potato’s surface while the roughed-up starch forms a crust. Hot fat, space, and time do this — the specific fat is the flavour layer on top. BBC Good Food’s roast potato guide covers the method in detail.

My verdict: goose fat for Christmas, vegetable oil for every other Sunday, and the method followed religiously either way. Get the parboil, the roughing-up and the hot fat right, and you’ll get the kind of roasties people talk about afterwards. Which, for a side dish, is about as good as it gets.

Roast Potato FAQs

Which potato variety is best for roasting?
Maris Piper is the gold standard — floury, fluffy, crisps beautifully. King Edward, Desiree and Rooster are excellent alternatives. Avoid waxy varieties (Charlotte, Jersey Royals) — they stay dense and never develop that shattering crust, regardless of technique.

Can I parboil potatoes ahead of time?
Yes — parboil, rough up, and refrigerate uncovered for up to 24 hours. The surface dries out further in the fridge, which actually improves crisping. On the day, straight into hot fat from cold. This is the Christmas Day sanity-saver.

Why are my roast potatoes soggy, not crispy?
The usual culprits: fat wasn’t hot enough when potatoes went in, tray overcrowded (steam instead of roast), oven too cool, or waxy potatoes. Fix all four and crispness is guaranteed — it’s physics, not luck.

Goose fat vs beef dripping — which wins?
Honestly? Personal preference. Goose fat is richer and more savoury; beef dripping is meatier with incredible crisping. Both beat vegetable oil on flavour; vegetable oil matches them on crispness. For Christmas, goose fat for tradition. For taste tests, try both and pick your champion.

The Roast Potato Beyond Sunday

Roast potatoes aren’t just for roasts. Leftover roasties — if such a thing exists in your house — make the best breakfast hash (chopped, fried with onion and a fried egg on top), upgrade any salad, or become patatas bravas with a smoky tomato sauce and garlic aioli. Cold roast potatoes are also the correct potato for a Spanish tortilla.

And the technique transfers: the parboil-rough-hot-fat method works for roast parsnips, carrots, and even cauliflower (tossed in spiced oil). Once you understand the principle — rough starchy surfaces + fierce heat + space — you can crisp almost any root vegetable. The roast potato is just the beginning of a crispy-vegetable education.

The Bottom Line on Roast Potato Fat

Goose fat wins on flavour, beef dripping runs it close, and vegetable oil gets you 90% of the way on crispness for everyday roasts. But the fat is the garnish on the real story: floury potatoes, a proper parboil, roughed-up edges, screaming-hot fat, and space in the tray. Get the method right and any fat delivers; get it wrong and no fat saves you.

My verdict after years of testing: goose fat for Christmas (tradition matters), vegetable oil for every other Sunday (sanity matters more), and the method followed religiously either way. Parboil, rough up, hot fat, don’t crowd, turn once. Those five steps are the difference between roast potatoes and roast potatoes people talk about afterwards. For a side dish, that’s about as good as it gets.

The leftover strategy extends the value: roast a big tray on Sunday and you’ve got Monday’s hash, Tuesday’s patatas bravas, Wednesday’s soup topping. Deliberate surplus is the meal-prepper’s secret — the extra twenty minutes on Sunday buys three weeknight shortcuts. And cold roast potatoes are the correct base for a proper Spanish tortilla. The roast potato keeps giving long after Sunday lunch.

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