Best Oil for Roast Potatoes: Which Cooking Fat Gives the Crispiest Results?

Nothing completes a roast dinner quite like perfectly crispy roast potatoes. Golden and crunchy on the outside, soft and fluffy in the middle, they're a favourite on British dinner tables all year round.

But achieving that perfect texture starts with choosing the right cooking fat.

Whether you're deciding between beef tallow, goose fat, duck fat, olive oil or vegetable oils, each option offers something slightly different. In this guide, we'll explain the advantages of each so you can choose the best oil for your next roast.

What Is the Best Oil for Roast Potatoes?

There isn't a single correct answer because it depends on the flavour and texture you're looking for.

For many traditional British cooks, beef tallow, goose fat and duck fat remain the gold standard thanks to their ability to create beautifully crisp roast potatoes while adding a rich, savoury flavour.

If you prefer a vegetarian option, rapeseed oil or sunflower oil are excellent alternatives because of their neutral taste and high smoke points.

Why Beef Tallow Makes Excellent Roast Potatoes

Beef tallow has been used in British kitchens for generations and has recently become popular again among home cooks looking for traditional cooking methods.

Its naturally high smoke point makes it ideal for roasting at high temperatures, helping potatoes develop an irresistibly crispy outer layer while remaining fluffy inside.

Many people also enjoy the rich depth of flavour that beef tallow brings to roast potatoes, making it especially popular for Sunday lunches and festive meals.

Benefits include:

• High smoke point
• Excellent crispness
• Rich traditional flavour
• Suitable for high-temperature roasting
• Naturally stable during cooking

Comparing the Best Oils for Roast Potatoes

Can You Use Beef Tallow for Roast Potatoes?

Yes.

Beef tallow is one of the best fats for roasting potatoes because it withstands high temperatures without breaking down easily.

To get the best results:

• Preheat the tallow until it's hot before adding the potatoes.
• Parboil the potatoes first.
• Rough up the edges after draining.
• Turn them halfway through cooking.

These simple steps help create the crunchy exterior that roast potatoes are famous for.

Which Potatoes Work Best?

The variety of potato is just as important as the cooking fat.

Great choices include:

• Maris Piper
• King Edward
• Rooster
• Desiree

These varieties become fluffy inside while crisping beautifully on the outside.

Tips for Extra Crispy Roast Potatoes

Even the best oil won't produce perfect roast potatoes without the right technique.

For consistently great results:

• Parboil before roasting.
• Allow steam to escape before roasting.
• Shake the potatoes to roughen the edges.
• Preheat the cooking fat.
• Avoid overcrowding the roasting tray.
• Turn halfway through cooking.
• Roast at around 200–220°C.

Should You Choose Beef Tallow or Vegetable Oil?

Both have their place.

Vegetable oils are widely available and have a neutral flavour, making them suitable for many recipes.

If you're looking for a more traditional roast with maximum crispiness and a richer flavour, beef tallow remains a favourite choice among many home cooks.

The best option depends on your dietary preferences and the flavour you're hoping to achieve.

Frequently Asked Questions

What oil makes roast potatoes the crispiest?

Fats with high smoke points such as beef tallow, goose fat, duck fat and rapeseed oil generally produce the crispiest results.

Is beef tallow better than olive oil?

For roasting potatoes at high temperatures, many cooks prefer beef tallow because of its higher smoke point and richer flavour.

Can I use olive oil?

Yes. Olive oil works well, although it may not create quite the same level of crispness as fats with higher smoke points.

What temperature should roast potatoes be cooked at?

Around 200–220°C (180–200°C fan) is ideal for achieving a crisp exterior while keeping the inside fluffy.

Do I need to parboil potatoes first?

Parboiling helps soften the potatoes and creates rough edges, which become wonderfully crispy during roasting.

Conclusion

Choosing the best oil for roast potatoes depends on the flavour and texture you're looking for. While vegetable oils, rapeseed oil and olive oil all have their place, traditional fats such as beef tallow continue to be a favourite for producing exceptionally crispy, golden roast potatoes.

Combined with the right potato variety and a few simple cooking techniques, the right cooking fat can transform an ordinary roast into something truly memorable.