01 - Preheat oven to 425°F. Place a large roasting tray inside to heat up while you prepare the potatoes.
02 - Place peeled potato chunks in a large saucepan. Cover with cold water and add 1 tbsp salt. Bring to a boil, then reduce heat and simmer for 8–10 minutes until edges begin to soften but centers remain firm.
03 - Drain potatoes thoroughly in a colander and let steam dry for 2 minutes. Return to the saucepan and shake vigorously to fluff up the edges—this creates maximum crispiness.
04 - Carefully pour hot oil or fat over the potatoes. Gently toss to coat evenly, ensuring all surfaces are covered.
05 - Remove the preheated roasting tray from the oven. Carefully tip potatoes into the hot tray and spread into a single layer, spacing apart for even browning. Add garlic cloves and herb sprigs if using.
06 - Roast for 20 minutes until potatoes begin to turn golden underneath.
07 - Turn potatoes using a spatula. Roast for another 20–25 minutes, turning once more if necessary, until deep golden brown and crispy all over.
08 - Remove from oven. Sprinkle with sea salt flakes and freshly ground black pepper. Serve immediately while hot and crispy.