01 - Preheat the oven to 430°F. Place a large roasting tray inside to heat up while you prepare the potatoes.
02 - Place the peeled and cut potatoes in a large saucepan. Cover with cold water and add 1 tbsp salt.
03 - Bring to a boil over high heat, then reduce to a simmer. Cook for 8–10 minutes until the edges begin to soften but the potatoes are not cooked through.
04 - Drain the potatoes well in a colander and let them steam dry for 2 minutes. Return them to the pan and shake vigorously to roughen the edges, creating a crispy exterior.
05 - Carefully pour the hot oil or fat into the saucepan with the potatoes. Gently toss to coat evenly.
06 - Remove the hot roasting tray from the oven. Carefully tip the potatoes into the tray, spreading them out in a single layer without overcrowding. Add garlic and herbs if using.
07 - Roast for 20 minutes until the bottoms begin to brown.
08 - Turn the potatoes using a spatula. Roast for another 20–25 minutes, turning once more halfway through, until golden brown and crispy all over.
09 - Remove from the oven. Season immediately with sea salt flakes and black pepper. Serve hot while crispy.