01 - Preheat the oven to 430°F. Place a large roasting tray inside the oven to heat up while you prepare the potatoes.
02 - Place the peeled and cut potato chunks in a large saucepan. Cover with cold water and add 1 tablespoon of salt.
03 - Bring the water to a boil over high heat, then reduce to medium heat and simmer for 8–10 minutes. The edges should begin to soften, but the potatoes should remain firm in the center.
04 - Drain the potatoes thoroughly in a colander and let them steam dry for 2 minutes. Return to the saucepan and shake vigorously to roughen the exterior edges—this creates extra crispy surfaces.
05 - Pour the hot oil or fat over the parboiled potatoes. Gently toss or stir to ensure each piece is evenly coated.
06 - Carefully remove the hot roasting tray from the oven. Tip the potatoes into the tray and spread them out in a single, even layer. Add crushed garlic and herb sprigs if using.
07 - Roast for 20 minutes until the bottoms begin to turn golden brown.
08 - Turn the potatoes using a metal spatula. Roast for another 20–25 minutes, turning once more halfway through, until all sides are deeply golden and crispy.
09 - Remove from the oven. Season generously with sea salt flakes and freshly ground black pepper. Serve immediately while hot and crispy.