01 - Preheat oven to 430°F. Place a large roasting tray inside to heat up while preparing potatoes.
02 - Place peeled potato chunks in a large saucepan. Cover with cold water and add 1 tablespoon salt. Bring to a boil, then simmer for 8-10 minutes until edges begin to soften but potatoes remain firm in center.
03 - Drain potatoes thoroughly in a colander and let steam dry for 2 minutes. Return to the saucepan and shake vigorously to roughen the surface edges for maximum crispiness.
04 - Pour hot oil or fat over the potatoes. Gently toss to coat evenly, ensuring all surfaces are covered.
05 - Carefully remove hot roasting tray from oven. Transfer potatoes into tray, spreading in a single even layer without overcrowding. Add garlic cloves and herb sprigs if using.
06 - Roast for 20 minutes until bottoms begin to turn golden brown.
07 - Turn potatoes over with a spatula. Continue roasting for 20-25 additional minutes, turning once more if necessary, until all sides are deep golden brown and crispy.
08 - Remove from oven. Season generously with sea salt flakes and freshly ground black pepper. Transfer to serving dish and serve immediately while hot and crispy.