Ultimate Crispy Roast Potatoes - The Best Roasties Recipe

These are the BEST roast potatoes you will ever make. Boiled in flavoured water, ruffled until fluffy, dusted in cornflour, and roasted in screaming hot fat until impossibly crispy outside and fluffy in the middle. Save the potato water and it becomes the base for the most incredible chicken gravy too. Let's cook!

Watch me make this on YouTube!

Why These Roast Potatoes Work

Crispy roast potatoes with fluffy centres take about 1 hour 15 minutes from peel to plate. The method has three moves that all work together: a 10-minute par boil to soften the edges, a vigorous shake in the colander to create rough, ruffled surfaces, and a coating of cornflour before the potatoes hit smoking-hot fat. Those ruffled edges are the whole game. They create maximum surface area and soak up the cornflour in a way that smooth potatoes simply cannot. The fat needs to be genuinely smoking when the potatoes go in, exactly like chips dropping into a hot fryer. That instant seal is what gives you the crunch and stops them sticking to the tray.

Recipe Details

• Prep Time: 15 minutes
• Cook Time: 50 to 60 minutes
• Total Time: 1 hour 15 minutes
• Serves: 4 to 6 (allow 1 to 1.5 potatoes per person)
• Difficulty: Easy
• Special Equipment: Large saucepan, colander, roasting tray

The fat you choose makes a real difference here. I always save the fat rendered from cooking beef, lamb, or duck throughout the year and roast potatoes are exactly what it is for. After years of testing, beef dripping or lamb dripping wins every time, with duck fat a close second. If you are using oil, make sure it has a high smoke point and get it genuinely smoking before the potatoes go in. The other thing that never changes no matter how many times I make this: the ruffling step cannot be rushed. Give the colander a really hard shake until the potatoes look genuinely battered. Those rough edges are where all the crunch comes from.

Ingredients

For the Potatoes:

• 6 to 8 large floury potatoes (allow 1 to 1.5 per person) - Maris Piper, King Edward, or Rooster work best in the UK, or Agria here in NZ
• Cold water, enough to cover the potatoes

For Flavouring the Boiling Water (Traditional):

• 1 onion, halved (no need to peel)
• 1 whole bulb of garlic, halved horizontally
• 4 to 5 sprigs fresh thyme
• 2 to 3 sprigs fresh rosemary
• 1 tablespoon salt

Alternative Flavouring Options:

• Stock-based: 1 chicken or vegetable stock cube
• Indian-spiced: 1 tablespoon curry powder, 1 teaspoon turmeric, 4 curry leaves, 4 cloves garlic
• Cajun-spiced: 2 tablespoons Cajun seasoning

For Roasting:

• 100 to 150ml fat for roasting (beef dripping, duck fat, goose fat, or vegetable oil)
• 3 to 4 tablespoons cornflour
• Seasoning for coating: 1 teaspoon salt and ½ teaspoon black pepper (classic), or 1 packet instant noodle seasoning (incredible!), or 2 teaspoons of your chosen spice blend

How to Make Crispy Roast Potatoes

1. Peel and prepare the potatoes: Peel the potatoes and cut them into even-sized chunks, roughly halves or quarters depending on size. You want them all a similar size so they cook evenly. Place them in a large saucepan.
2. Add cold water and flavourings: Cover the potatoes completely with cold water. Add your chosen flavourings. For the traditional version, add the halved onion, halved garlic bulb, thyme, rosemary, and salt. Starting with cold water helps the potatoes cook evenly throughout.
3. Bring to the boil: Place the pan over high heat and bring to a rolling boil.
4. Boil for 10 minutes: Once boiling, reduce the heat slightly to maintain a steady boil and cook for exactly 10 minutes. The potatoes should be just tender on the outside but still firm in the centre when you insert a knife. Set a timer and do not overcook them.
5. Save the water: Place a colander over a large bowl or jug. Drain the potatoes through the colander, catching all the flavoured water below. This liquid is packed with potato starch and all those aromatics. It is perfect for making the gravy. Save every drop and do not throw it away.
6. Ruffle the potatoes: Remove any large herbs or the onion and garlic from the colander. Give the colander a really vigorous shake and rattle to rough up the edges of the potatoes. You want them to look battered and fluffy all over. These rough bits are what become super crispy in the oven.
7. Steam dry: Leave the ruffled potatoes in the colander to steam dry for 5 to 10 minutes while you heat the fat. Dry potatoes crisp up far better than wet ones.
8. Heat the fat: Place a large roasting tray in the oven and preheat to 200°C (180°C fan / 400°F / Gas Mark 6). Add your chosen fat to the tray. The fat should be about 2mm deep. Let it heat in the oven for 10 to 15 minutes until it is smoking hot.
9. Coat the potatoes: While the fat is heating, place the cornflour and your chosen seasoning in a large bowl or clean bag. Add the cooled, ruffled potatoes and toss until every surface is coated in the cornflour mixture.
10. Add to the hot fat: Carefully remove the roasting tray from the oven. Working quickly, add the coated potatoes to the hot fat. You should hear a satisfying sizzle. Space them out in a single layer, turning each one so it is coated in the hot fat on all sides.
11. Roast undisturbed: Return the tray to the oven and roast for 25 to 30 minutes without opening the door. Resist the urge to check on them and let them develop that crispy base.
12. Turn and continue roasting: After 25 to 30 minutes, remove the tray and turn each potato over using tongs or a fish slice. Return to the oven and roast for another 25 to 30 minutes until every side is golden, crispy, and absolutely beautiful.
13. Drain and serve: Transfer the potatoes to a serving dish lined with kitchen paper to drain any excess fat. Serve immediately while they are at their crispiest.

Why You'll Love This Recipe

• The crispiest roasties you will ever make: The combination of ruffled edges, cornflour coating, and properly hot fat creates a crunch that is genuinely extraordinary.
• Flavour from the inside out: Boiling in flavoured water means the flavour runs all the way through the potato, not just on the surface.
• Completely customisable: Season the water and coating however you like. Traditional herbs, curry spices, Cajun, or anything else your Christmas table calls for.
• Bonus gravy base included: The flavoured potato water is the secret ingredient in the roast chicken gravy. Nothing goes to waste.
• Foolproof once you know the steps: Follow the method and you will get perfect roasties every single time.

Chef's Tips for Crispy Roast Potatoes

Save that potato water: The flavoured, starchy water from boiling the potatoes becomes the base for the chicken pan gravy. Never pour it down the drain.

Choose the right potato: Floury potatoes are essential. Waxy potatoes will not get fluffy inside or crispy outside in the same way. Maris Piper, King Edward, Rooster, or Agria are all ideal.

The fat must be smoking hot: This is the non-negotiable step. If the fat is not hot enough, the potatoes will absorb it and go greasy instead of crispy. It should be visibly smoking when you add the potatoes.

Do not overcrowd the tray: The potatoes need space for hot air to circulate and crisp them all over. Use two trays if you need to. Overcrowding is the most common reason for soggy roasties.

Save your dripping: When you cook fatty meats like beef, lamb, or duck throughout the year, save the rendered fat in a jar in the fridge. It is liquid gold for roast potatoes.

The instant noodle hack: Using the seasoning packet from instant noodles (like Indomie) in the cornflour coating is a genuinely brilliant flavour trick. Try it at least once.

Substitutions & Variations

• Traditional herb version: Boil with onion, garlic, thyme, and rosemary. Coat with salt and pepper only. Classic and always perfect.
• Indian-spiced roasties: Boil with curry powder, turmeric, garlic, and curry leaves. Add more curry powder to the cornflour coating. Incredible with roast chicken or lamb.
• Cajun roasties: Add Cajun seasoning to the boiling water and more to the cornflour coating.
• Garlic and herb: Boil with lots of garlic and mixed herbs, then add garlic granules and dried herbs to the cornflour mix.
• Stock-enriched: Add a chicken or beef stock cube to the boiling water for extra savoury depth.
• Vegan version: Use vegetable oil instead of animal fat. Still incredibly crispy and delicious.
• Parmesan roasties: Add grated Parmesan to the cornflour coating for a cheesy, salty crust.

Storage

Best eaten fresh: Roast potatoes are at their absolute best straight from the oven while the cornflour crust is still shattering crispy. They will soften as they sit, so get them to the table as soon as they come out.

Fridge: Leftovers can be stored in an airtight container in the fridge for up to 2 days. Reheat in a 200°C (180°C fan / 400°F / Gas Mark 6) oven for 10 to 15 minutes until hot and crispy again. They will not be quite as good as fresh but they are still delicious.

Freezer: Not recommended. Roast potatoes lose their crispy texture when frozen and defrosted. Make them fresh on the day for best results.

Avoid: Never reheat roast potatoes in the microwave. They will go completely soft and soggy. Always use the oven to bring back the crispiness.

Frequently Asked Questions

Can I use sweet potatoes instead of regular potatoes? Yes, but sweet potatoes are softer so reduce the boiling time to 5 to 7 minutes and watch them carefully during roasting as they brown faster than regular potatoes.

What can I use instead of beef dripping for roast potatoes? Duck fat, goose fat, or plain vegetable oil all work well. Olive oil works too but has a lower smoke point so watch the temperature. The key is getting whatever fat you use properly smoking hot.

Do I really need to ruffle the potatoes? Yes, absolutely. The rough, fluffy edges created by ruffling give you dramatically more surface area to crisp up. Smooth potatoes will not get anywhere near as crunchy. This step is not optional.

Do you really need cornflour for crispy roast potatoes? You can skip it, but the cornflour is what creates that extra-crispy shell. Plain ruffled potatoes in hot fat are still good, but the cornflour takes them from good to genuinely extraordinary. Do not skip it.

My roast potatoes are not getting crispy. What went wrong? The most common reasons are: fat was not hot enough when the potatoes went in, potatoes were overcrowded on the tray, they were not ruffled enough, or the cornflour coating was skipped. Check all four of these next time.

Can you prep roast potatoes ahead of time? Yes! Complete steps 1 to 7 (boiling, draining, ruffling, and steam drying) up to 4 hours ahead. Leave the potatoes in the colander at room temperature and coat with cornflour just before roasting. A great Christmas morning time-saver.

What do you serve with roast potatoes at Christmas? These roasties are the centrepiece side of the Savvy Suppers Christmas menu. They pair perfectly with roast chicken with easy pan gravy, peas with caramelised onions, and a fresh courgette and feta salad. The full meal plan is on the Budget Christmas Dinner Menu page.

You Might Also Like

Budget Christmas Dinner Menu - Savvy Suppers - The full Christmas episode hub with shopping list, complete timeline, and links to all five recipes.

Roast Chicken with Easy Pan Gravy - The Christmas main that uses your saved potato water to make the most incredible pan gravy with zero extra effort.

Peas with Caramelised Onions and Lemon Garlic Breadcrumbs - Another Christmas side from the same menu, and the perfect accompaniment to these roasties.

Once you make roast potatoes this way you will never go back to any other method. The combination of flavoured water from the inside, ruffled edges on the outside, and that cornflour crust hitting screaming hot fat is genuinely transformative. They look spectacular, they taste incredible, and they are simpler than they sound. Make the boiling and ruffling part your Christmas morning job, coat and roast an hour before you want to sit down, and you will have the crispiest potatoes anyone at your table has ever eaten.

Enjoy!

Del x

The crispiest roast potatoes you will ever make. Par boiled in flavoured water, ruffled until fluffy, dusted in cornflour, and roasted in smoking hot fat. The potato water even becomes the gravy. Nothing wasted, everything delicious.