Heston Blumenthal cooks his perfect roast potatoes recipes on How to Cook Like Heston
Heston: "This recipe makes roast potatoes just the way I like them – with a crisp, glass-like crust and a fluffy interior. The key is to cut the potatoes so they have lots of sharp edges then to cook them until they are almost falling apart. Don’t scrimp on the amount of oil added to the pan – it is the fat gathering in the cracks that make the potatoes so crispy. Olive oil works really well or you can use goose fat or beef dripping but they will give a different flavour.
The garlic and rosemary are optional. You can either add them to the water when boiling the potatoes or to the roasting tray 5 minutes before the end of the cooking time."
Preheat the oven to 180ºC/fan 160ºC/gas mark 4.
Wash and peel the potatoes and cut into quarters. Put them into a bowl under running water for 5 minutes to wash the starch off.
Cover the potatoes with water in a large saucepan then add the garlic and rosemary if using and bring to the boil. Cook until the potatoes are very soft and almost breaking apart (approximately 25–30 minutes). Drain carefully and leave to cool in the colander.
Pour 5mm of olive oil into a roasting tray large enough to hold the potatoes in one layer. Place the tray in the oven to pre-heat the oil for 15 minutes.
Add the potatoes to the pan and coat them in the hot oil. Place the tray back in the oven for at least 1 hour and 15 minutes, turning the potatoes gently every 20 minutes, until the potatoes are golden brown and crispy all over.
Drain on kitchen paper and season with salt.
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