01 - Preheat the oven to 430°F. Place a large roasting tray inside to heat up while preparing the potatoes.
02 - Place peeled and cut potatoes in a large saucepan. Cover with cold water and add 1 tbsp salt. Bring to a boil, then simmer for 8–10 minutes until edges begin to soften but centers remain firm.
03 - Drain potatoes well and let steam dry for 2 minutes. Return to the pan and shake vigorously to roughen the surfaces, creating crispy edges.
04 - Pour hot oil or fat over the potatoes. Gently toss to coat evenly, ensuring all surfaces are covered.
05 - Remove hot roasting tray from oven. Carefully tip potatoes into the tray, spreading in a single layer without overcrowding. Add garlic cloves and herb sprigs if desired.
06 - Roast for 20 minutes, then turn potatoes. Continue roasting for 20–25 minutes, turning once more if needed, until deeply golden brown and crispy throughout.
07 - Sprinkle with sea salt flakes and freshly ground black pepper. Serve immediately while hot and crispy.