
Achieve the perfect roast potato with a glass-like crunch on the outside and a fluffy, cloud-like interior. By parboiling and roughing up the edges with semolina, you create the ultimate surface area for maximum crispiness.
Preheat your oven to its highest setting (ideally 250°C/480°F). Pour the oil into a heavy-duty metal or cast iron roasting pan and place it in the oven to heat up until shimmering.
Peel the potatoes and cut them into large, uniform chunks, approximately 6cm (2.5 inches) wide. This size ensures a good ratio of crunchy exterior to soft middle.
Bring a large pot of salted water to a boil. Add the potatoes and parboil for exactly 10 minutes. They should be softened on the outside but still firm in the center.
Drain the potatoes thoroughly and return them to the dry pot. Sprinkle the semolina and salt over the top. Cover with a lid and shake the pot vigorously about 5 times to 'rough up' the edges of the potatoes; this starchy mash is what creates the crunch.
Carefully remove the hot pan from the oven. Test the oil by dropping in a small piece of potato—it should sizzle immediately. Carefully transfer the potatoes into the hot oil, watching for splashes.
Using a metal spatula or egg flip, quickly toss the potatoes to ensure every side is coated in the hot oil. Spread them out in a single layer and return the pan to the oven.
Immediately turn the oven temperature down to 220°C (425°F). Roast for 50 to 75 minutes, turning the potatoes once halfway through. They are done when they are deep golden brown and feel very hard and crunchy to the touch.
Serve immediately for the best texture. If you have leftovers, they can be reheated at 220°C (425°F) for 15 minutes to restore their crispiness.
For the best results, use starchy potato varieties like Maris Piper, King Edward, or Russets. If you don't have semolina, you can substitute with plain flour or polenta to help build that extra-thick crust.




