01 - Preheat oven to 430°F. Place a large roasting tray inside to heat up while you prepare 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 potatoes are not cooked through.
03 - Drain potatoes well in a colander and let steam dry for 2 minutes. Return to the pan and shake vigorously to roughen the edges, creating crispy texture during roasting.
04 - Carefully pour hot oil or fat over the potatoes. Toss gently to coat evenly without breaking the pieces.
05 - Remove hot roasting tray from oven. Carefully tip potatoes into the tray, spreading in a single layer with space between pieces. Add garlic cloves and herb sprigs if using.
06 - Roast for 20 minutes, then turn potatoes. Continue roasting for another 20-25 minutes, turning once more if needed, until deep golden brown and crispy on all sides.
07 - Season generously with sea salt flakes and freshly ground black pepper. Serve immediately while hot and crispy.