How to Make Crispy Roast Potatoes That Actually Stay Crispy

The secret to crispy roast potatoes comes down to three things: the right potato, roughed-up edges, and a screaming hot pan with plenty of fat. Get those three right and you'll pull a tray of shatteringly golden, fluffy-centred potatoes out of the oven every single time. No more pale, soft, disappointing spuds. Just the real deal.

I've made roast potatoes more times than I can count, and I spent a long time wondering why mine never matched what I grew up eating at my nan's table. Turns out she had a few tricks she never thought to mention because they were just second nature to her. Once I figured them out, everything changed.

Choose the Right Potato

This is where most people go wrong before they even switch the oven on. Waxy potatoes like new potatoes or red-skinned varieties hold their shape too well, so you get a soft, dense result with very little crust. What you want is a floury, high-starch potato.

In the UK, Maris Piper and King Edward are the standard. In the US, Russet potatoes work beautifully. These varieties have a fluffy interior that cooks up light and airy, and their higher starch content means the outside crisps up dramatically once it hits hot fat.

Cut them into generous chunks, roughly the size of a golf ball or a little bigger. Too small and they dry out before the inside is cooked. Too large and the outside is done long before the centre catches up.

Parboil Until the Edges Are Fluffy

Start your potatoes in cold, well-salted water and bring them up to a boil together. This matters. Starting in cold water means the potato cooks more evenly from the outside in, rather than the outside going mushy while the centre stays raw.

Boil them for around 10 to 15 minutes. You're not trying to cook them through. You want a fork to just pierce the outer layer with a little resistance, and the outside should look slightly soft and almost powdery when you pull them out.

Drain them well, then put the lid back on the pan and give it a good shake. This is the move. That shaking scuffs up the surface of each potato chunk, creating a rough, jagged exterior full of little ridges and nooks. Those rough edges are what turns into the crunchy, lacy crust everyone fights over at the table.

Let them steam dry in the colander or pot for a few minutes after that. Moisture is the enemy of crispiness, so getting rid of as much as possible at this stage pays off later.

Get Your Fat Screaming Hot

Preheat your oven to 220°C (425°F), or even a little higher if your oven runs cool. Put your roasting tin with your chosen fat inside while the oven heats up. The fat needs to be genuinely hot, almost smoking, before the potatoes go in. Non-negotiable.

Duck fat is my first choice. It gives the potatoes a richness and depth of flavour that's hard to beat, and it handles high heat without burning. Goose fat is equally good. If you want to keep things plant-based, refined coconut oil or a good quality vegetable oil with a high smoke point works well. Olive oil gives a lovely flavour but smokes a lot at very high temperatures, so use it if you prefer and just keep an eye on things.

You need enough fat to generously coat the bottom of the pan. A thin scrape is not enough. Be generous.

Coat and Roast Without Peeking

Carefully add the parboiled chunks to the hot fat. You should hear a satisfying sizzle the moment they hit the pan. That sound means you're on the right track. Turn each piece so it's coated all over, then spread them out so they're not crowded. Overcrowding causes steaming instead of roasting, and steaming gives you soft potatoes.

Roast for 45 to 55 minutes, turning once about halfway through. I know it's tempting to keep opening the oven and fussing with them, but every time you open that door you let heat escape. Turn them once and let the oven do its work.

When they come out, they should be deeply golden. Not pale yellow, but a rich amber-brown. That colour is flavour.

Season at the Right Moment

Salt goes on after they come out of the oven, not before. Salting raw potatoes draws out moisture, which is the opposite of what you want here. A generous pinch of flaky sea salt the moment they hit the serving dish is all you need.

Fresh rosemary tucked around the potatoes in the last 10 minutes of cooking adds a good herby aroma without burning. Garlic cloves left in their skins and roasted alongside work the same way. You can squeeze out the soft, sweet garlic onto the potatoes as you eat them, and honestly that alone is worth doing.

A Few Things That Make a Real Difference

The semolina trick: toss the parboiled potatoes in a tablespoon of semolina before they go into the fat. It creates an extra-crunchy coating that stays crispy even as the potatoes cool down a little. I was sceptical the first time I tried it. I'm not sceptical anymore.

Always a single layer. If your tin is too small, use two tins. Crowding ruins everything. And give them two or three minutes on the tray out of the oven before serving. They firm up just a little more as they rest.

None of this is complicated. These are just the small, deliberate steps that make the difference between potatoes that are fine and potatoes that people talk about on the drive home. Make them this way once and you'll see what I mean.