Crisp Roast Potatoes

Name: Crisp Roast Potatoes
Prep time: 15 min
Cook time: 1 h 5 min
Total time: 1 h 20 min
Yield: 6 servings
Ingredients: 1.5 kg floury potatoes such as Maris Piper or King Edward, peeled and cut into 5cm pieces; 2 litres water, for parboiling; 20 g fine sea salt, for the parboiling water; 1 tsp bicarbonate of soda; 150 g beef dripping, goose fat or a neutral oil with a high smoke point; 6 sprigs thyme; 4 garlic cloves, unpeeled and lightly crushed; Flaky sea salt, to finish

Floury potatoes parboiled with bicarbonate of soda, roughed up in the pan, then roasted in fat that is already smoking hot.

Prep: 15 min
Cook: 1 hr 5 min
Total: 1 hr 20 min
Serves: 6
Revisions: 5

Crisp Roast Potatoes — shot from directly overhead: floury potatoes parboiled with bicarbonate of soda

Ingredients

Serves

1.5 kg floury potatoes such as Maris Piper or King Edward, peeled and cut into 5cm pieces
2 litres water, for parboiling
20 g fine sea salt, for the parboiling water
1 tsp bicarbonate of soda
150 g beef dripping, goose fat or a neutral oil with a high smoke point
6 sprigs thyme
4 garlic cloves, unpeeled and lightly crushed
Flaky sea salt, to finish

Method

Heat the oven to 220C/425F with a large heavy roasting tin on the middle shelf.
Bring the 2 litres of water to a boil in a large pan with the 20g of fine salt and the bicarbonate of soda.
Use no more bicarbonate of soda than the teaspoon. It turns the water alkaline, which breaks the pectin at the surface of each piece down into the starchy slurry that later crisps; twice as much takes the potatoes past that and they collapse in the pan and taste faintly soapy.
Add the potato pieces and bring the water back to a boil.
Simmer for 8-10 minutes, until a knife tip goes 5mm into a piece easily and meets firm resistance at the centre.
Drain them in a colander.
Leave them to stand for 2-3 minutes, until the steam has stopped rising and the surfaces have gone matt and chalky.
Tip the pieces back into the empty dry pan.
Put the lid on and shake the pan hard three or four times, until the outsides are ragged and coated in a paste of their own starch.
Stop shaking there. Those ragged edges are the entire surface you are about to crisp, but keep going and the pieces break into rubble that browns to nothing.
Take the hot tin out of the oven and add the dripping to it.
Return the tin to the oven for 5 minutes, until the fat is thin, loose and shimmering.
Lower the potatoes into the hot fat one piece at a time, standing back from the tin as they go in.
Turn each piece over so every face is coated in fat.
Space them out with a couple of centimetres of bare metal between them. A packed tin traps the steam coming off the potatoes and they come out pale and soft, so use two tins rather than crowding one.
Roast for 25 minutes without touching them.
Turn each piece onto a fresh face with a spatula, scraping up any that have stuck.
Tuck in the thyme sprigs and the crushed garlic cloves.
Roast for a further 20-30 minutes, until the potatoes are deep brown all over and rasp audibly when pushed with a spoon.
Lift them out of the fat onto a warm serving dish with a slotted spoon.
Never cover them or pile them into a deep bowl. The crust is thin, and steam from the potatoes underneath softens it within minutes.
Scatter with flaky salt and serve at once, alongside the roast chicken with lemon and thyme or anything else with gravy.

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What to expect

Taste: Deeply savoury from the roasting fat, whichever one is used — dripping and goose fat both carry a meaty richness that a neutral oil does not, soaking into the craggy surface of the potato — with the garlic and thyme adding a background savoury sweetness rather than a dominant flavour of their own.
Aroma: A rich, meaty smell if dripping or goose fat is used, joined partway through roasting by the more herbal, aromatic smell of thyme and garlic as they roast alongside the potatoes.
Texture: A genuinely crisp, almost brittle crust giving way instantly to a soft, fluffy, almost powdery interior — the contrast between the two is the entire point of the dish, and it is a considerably more dramatic contrast than a plain roasted potato without the parboil-and-roughen method achieves.
Sound: An audible rasp or crackle when the crust is pushed with a spoon or bitten into, which is specifically listed as a doneness cue in its own right rather than just a texture description.
How the flavour moves: The crisp, savoury crust delivers an intense hit of the roasting fat's flavour first, the soft interior's milder, starchier potato flavour follows, and a faint garlic and herb note lingers at the back from whatever has roasted alongside them.
Serve it: Served hot, straight from the oven — the crust begins losing its crispness within minutes even at room temperature, let alone once cooled.
Goes with: Roast chicken with lemon and thyme, or any roast dinner with gravy — this is a side built specifically to be eaten alongside a roast joint rather than as a dish on its own.

Cook's notes

Difficulty: Easy, but the fine details — the bicarbonate quantity, the shaking, the smoking-hot fat — each matter more than they look like they should.
Cost: Low — potatoes are cheap; the fat (dripping or goose fat) is the main variable cost.
Equipment: A large pan for parboiling, a colander, and a large, heavy roasting tin.
When to make it: Sunday lunch, Christmas dinner, or any occasion built around a roast meal.
Best season: None; potatoes are available year round, though goose fat is more commonly stocked around Christmas.
You know it is done when: The finished potatoes should be deep brown on every face, not just the side that happened to sit in the fat, with a visibly craggy, uneven crust rather than a smooth skin.
And it feels like: Should rasp audibly when pushed with the back of a spoon, signalling a genuinely crisp crust, with a soft, fluffy interior underneath once broken open.
Food safety: The main hazard is handling hot fat and a hot tin — potatoes are lowered in one piece at a time, standing back, since hot fat can spit when cold or wet food meets it.
Where it goes wrong: Using twice the stated bicarbonate of soda, which pushes the potatoes into collapse and a faintly soapy taste.
Adding the potatoes to fat that is not yet hot, which lets them absorb fat rather than fry in it.
Crowding the tin, which traps steam and leaves the potatoes pale and soft rather than crisp.
Covering or piling the finished potatoes into a deep serving bowl, which softens the crust within minutes.
If it does go wrong: Potatoes came out pale and soft rather than crisp: the tin was likely too crowded, or the fat was not properly hot before they went in. Potatoes fell apart or tasted soapy: too much bicarbonate of soda was used in the parboiling water. Crust went soft after roasting: they were covered or piled up rather than served straight away on an open dish.
Making it ahead: The potatoes can be parboiled and roughened up to a day ahead and kept covered in the fridge, then roasted fresh in hot fat when needed, though the final roasting stage itself is not something to do far ahead of serving.
Keeping it: Keeps in the fridge for a day or two, though the crust does not survive storage and reheating with anything like its original texture.
Reheating: Best reheated in a hot oven directly on a tray, uncovered, to have any chance of recovering some crispness; a microwave will leave them soft throughout.
Freezing: Can be frozen after roasting, though like reheating, the crust is considerably diminished on thawing and reheating compared to fresh.
Leftovers: Better used chopped into a hash or fried again the next day than simply reheated whole, since a second direct application of hot fat recovers more crispness than an oven reheat alone.
Scaling it: Scales up by using a second roasting tin rather than overcrowding one large tin — the given method is explicit that crowding is what most often causes a soft rather than crisp result.
Substitutions: Floury potato varieties such as Maris Piper or King Edward hold more starch and less water than waxy varieties, which is what allows them to roughen up in the pan rather than staying smooth — a waxy potato will not give the same craggy surface however carefully the rest of the method is followed. Beef dripping or goose fat both stay stable at 220C/425F, where extra virgin olive oil smokes and turns bitter well below that temperature and is not a suitable substitute here.
Dietary swaps: No allergens as written when a neutral oil is used in place of dripping; check the specific fat used, since dripping and goose fat are both animal products and not suitable for a vegetarian or vegan diet.
Shopping for it: Beef dripping or goose fat are both traditional and worth seeking out for the Sunday-roast version, though a neutral high-smoke-point oil is a perfectly reasonable everyday substitute.
Keeping the cost down: A neutral oil with a high smoke point is a considerably cheaper option than dripping or goose fat and still produces a genuinely crisp result, since the fat's role here is mainly about heat and crust rather than a specific flavour.
Nutrition: A satisfying, energy-dense side dish, with the fat used for roasting contributing most of its richness.
Worth it?: A dish where a handful of specific, slightly counterintuitive details — the bicarbonate quantity, the pre-heated fat, not crowding the tin — make the entire difference between a mediocre and a genuinely excellent result.

Where it comes from

Origin: Britain.
Also called: Roast potatoes.
What the name means: Descriptive — potatoes cooked by roasting rather than boiling or frying.
History: Potatoes were a comparatively late arrival in British cooking, reaching Europe from the Andes in the second half of the 16th century and not becoming widely eaten in Britain until the 18th century. Roasting potatoes in the fat rendered from a joint of meat has no traceable single origin, having developed as an obvious use of the fat already in a roasting tin; the specific technique of parboiling with bicarbonate of soda and roughening the surface before roasting is a 20th-century refinement of that older, simpler practice, popularised through British television cooking from the 1970s onward rather than an older tradition in itself.
Why it matters: The default potato of the British and Irish Sunday roast, and a fixture of Christmas dinner in Britain, Australia and New Zealand.
When it is eaten: Sunday roasts and Christmas dinner above all, though suited to any roast meal.
The traditional way: Parboiling to soften the outer layer, roughening that softened surface by shaking in a dry pan, and roasting in fat that is already hot when the potatoes are added.
How it changed: The bicarbonate-of-soda parboil and the roughening step are both later refinements on a much older and simpler practice of roasting potatoes in a joint's fat; they specifically address getting a crisper crust than the older method reliably produced.
Regional variations: Dripping and goose fat are both traditional British choices, with goose fat particularly associated with Christmas; the parboil-and-roughen method itself is fairly consistent wherever this specific style is made, as opposed to a plainer roast potato with no parboiling stage at all.
Sources and credit: No individual is credited with inventing the parboil-and-roughen method; it spread through British recipe writing and television cooking rather than through any one documented source.

Categories

Cuisines

British

Courses & dish types

Side dishes

Main ingredients

Potatoes

What to expect

Taste

Deeply savoury from the roasting fat, whichever one is used — dripping and goose fat both carry a meaty richness that a neutral oil does not, soaking into the craggy surface of the potato — with the garlic and thyme adding a background savoury sweetness rather than a dominant flavour of their own.

Aroma

A rich, meaty smell if dripping or goose fat is used, joined partway through roasting by the more herbal, aromatic smell of thyme and garlic as they roast alongside the potatoes.

Texture

A genuinely crisp, almost brittle crust giving way instantly to a soft, fluffy, almost powdery interior — the contrast between the two is the entire point of the dish, and it is a considerably more dramatic contrast than a plain roasted potato without the parboil-and-roughen method achieves.

Sound

An audible rasp or crackle when the crust is pushed with a spoon or bitten into, which is specifically listed as a doneness cue in its own right rather than just a texture description.

How the flavour moves

The crisp, savoury crust delivers an intense hit of the roasting fat's flavour first, the soft interior's milder, starchier potato flavour follows, and a faint garlic and herb note lingers at the back from whatever has roasted alongside them.

Serve it

Served hot, straight from the oven — the crust begins losing its crispness within minutes even at room temperature, let alone once cooled.

Goes with

Roast chicken with lemon and thyme, or any roast dinner with gravy — this is a side built specifically to be eaten alongside a roast joint rather than as a dish on its own.

Cook's notes

Difficulty

Easy, but the fine details — the bicarbonate quantity, the shaking, the smoking-hot fat — each matter more than they look like they should.

Cost

Low — potatoes are cheap; the fat (dripping or goose fat) is the main variable cost.

Equipment

A large pan for parboiling, a colander, and a large, heavy roasting tin.

When to make it

Sunday lunch, Christmas dinner, or any occasion built around a roast meal.

Best season

None; potatoes are available year round, though goose fat is more commonly stocked around Christmas.

You know it is done when

The finished potatoes should be deep brown on every face, not just the side that happened to sit in the fat, with a visibly craggy, uneven crust rather than a smooth skin.

And it feels like

Should rasp audibly when pushed with the back of a spoon, signalling a genuinely crisp crust, with a soft, fluffy interior underneath once broken open.

Food safety

The main hazard is handling hot fat and a hot tin — potatoes are lowered in one piece at a time, standing back, since hot fat can spit when cold or wet food meets it.

Where it goes wrong

Using twice the stated bicarbonate of soda, which pushes the potatoes into collapse and a faintly soapy taste.
Adding the potatoes to fat that is not yet hot, which lets them absorb fat rather than fry in it.
Crowding the tin, which traps steam and leaves the potatoes pale and soft rather than crisp.
Covering or piling the finished potatoes into a deep serving bowl, which softens the crust within minutes.

If it does go wrong

Potatoes came out pale and soft rather than crisp: the tin was likely too crowded, or the fat was not properly hot before they went in. Potatoes fell apart or tasted soapy: too much bicarbonate of soda was used in the parboiling water. Crust went soft after roasting: they were covered or piled up rather than served straight away on an open dish.

Making it ahead

The potatoes can be parboiled and roughened up to a day ahead and kept covered in the fridge, then roasted fresh in hot fat when needed, though the final roasting stage itself is not something to do far ahead of serving.

Keeping it

Keeps in the fridge for a day or two, though the crust does not survive storage and reheating with anything like its original texture.

Reheating

Best reheated in a hot oven directly on a tray, uncovered, to have any chance of recovering some crispness; a microwave will leave them soft throughout.

Freezing

Can be frozen after roasting, though like reheating, the crust is considerably diminished on thawing and reheating compared to fresh.

Leftovers

Better used chopped into a hash or fried again the next day than simply reheated whole, since a second direct application of hot fat recovers more crispness than an oven reheat alone.

Scaling it

Scales up by using a second roasting tin rather than overcrowding one large tin — the given method is explicit that crowding is what most often causes a soft rather than crisp result.

Substitutions

Floury potato varieties such as Maris Piper or King Edward hold more starch and less water than waxy varieties, which is what allows them to roughen up in the pan rather than staying smooth — a waxy potato will not give the same craggy surface however carefully the rest of the method is followed. Beef dripping or goose fat both stay stable at 220C/425F, where extra virgin olive oil smokes and turns bitter well below that temperature and is not a suitable substitute here.

Dietary swaps

No allergens as written when a neutral oil is used in place of dripping; check the specific fat used, since dripping and goose fat are both animal products and not suitable for a vegetarian or vegan diet.

Shopping for it

Beef dripping or goose fat are both traditional and worth seeking out for the Sunday-roast version, though a neutral high-smoke-point oil is a perfectly reasonable everyday substitute.

Keeping the cost down

A neutral oil with a high smoke point is a considerably cheaper option than dripping or goose fat and still produces a genuinely crisp result, since the fat's role here is mainly about heat and crust rather than a specific flavour.

Nutrition

A satisfying, energy-dense side dish, with the fat used for roasting contributing most of its richness.

Worth it?

A dish where a handful of specific, slightly counterintuitive details — the bicarbonate quantity, the pre-heated fat, not crowding the tin — make the entire difference between a mediocre and a genuinely excellent result.

Where it comes from

Origin

Britain.

Also called

Roast potatoes.

What the name means

Descriptive — potatoes cooked by roasting rather than boiling or frying.

History

Potatoes were a comparatively late arrival in British cooking, reaching Europe from the Andes in the second half of the 16th century and not becoming widely eaten in Britain until the 18th century. Roasting potatoes in the fat rendered from a joint of meat has no traceable single origin, having developed as an obvious use of the fat already in a roasting tin; the specific technique of parboiling with bicarbonate of soda and roughening the surface before roasting is a 20th-century refinement of that older, simpler practice, popularised through British television cooking from the 1970s onward rather than an older tradition in itself.

Why it matters

The default potato of the British and Irish Sunday roast, and a fixture of Christmas dinner in Britain, Australia and New Zealand.

When it is eaten

Sunday roasts and Christmas dinner above all, though suited to any roast meal.

The traditional way

Parboiling to soften the outer layer, roughening that softened surface by shaking in a dry pan, and roasting in fat that is already hot when the potatoes are added.

How it changed

The bicarbonate-of-soda parboil and the roughening step are both later refinements on a much older and simpler practice of roasting potatoes in a joint's fat; they specifically address getting a crisper crust than the older method reliably produced.

Regional variations

Dripping and goose fat are both traditional British choices, with goose fat particularly associated with Christmas; the parboil-and-roughen method itself is fairly consistent wherever this specific style is made, as opposed to a plainer roast potato with no parboiling stage at all.

Sources and credit

No individual is credited with inventing the parboil-and-roughen method; it spread through British recipe writing and television cooking rather than through any one documented source.

Crisp Roast Potatoes

Ingredients

Method

What to expect

Cook's notes

Where it comes from

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Crisp Roast Potatoes

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