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 tablespoon salt. Bring to a boil, then simmer for 8-10 minutes until the edges begin to soften but the potatoes are not cooked through.
03 - Drain the potatoes well in a colander and let them steam dry for 2 minutes. Return them to the pan and gently shake to roughen the edges—this creates a crispy exterior.
04 - Carefully pour the hot oil or fat into the potatoes, tossing to coat evenly.
05 - Remove the hot roasting tray from the oven and carefully tip the potatoes into it, spreading them out in a single layer. Add garlic and herbs if using.
06 - Roast for 20 minutes, then turn the potatoes. Roast for a further 20-25 minutes, turning once more if needed, until golden brown and crispy.
07 - Season with sea salt flakes and black pepper. Serve immediately while hot and crispy.