01 - Preheat the oven to 430°F and 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 for 8–10 minutes until the edges begin to soften but the potatoes remain firm in the center.
04 - Drain the potatoes thoroughly in a colander and let them steam dry for 2 minutes. Return to the pan and shake vigorously to create rough, fluffy edges that will crisp up during roasting.
05 - Carefully pour the hot oil or fat over the potatoes and toss gently until evenly coated.
06 - Remove the hot roasting tray from the oven and carefully transfer the potatoes, spreading them in a single layer without overcrowding. Add garlic and herbs if using.
07 - Roast for 20 minutes until the bottom edges begin to turn golden.
08 - Turn the potatoes and roast for another 20–25 minutes, turning once more if needed, until deeply golden brown and crispy all over.
09 - Season immediately with sea salt flakes and freshly ground black pepper. Serve while hot and crispy.