01 - Preheat the oven to 425°F.
02 - Place potato chunks in a large pot, cover with cold water, and add 1 tbsp sea salt. Bring to a boil, then simmer for 8-10 minutes until edges are just tender but not fully cooked.
03 - Drain potatoes well and let steam dry for 2 minutes in the colander. Gently shake the colander to roughen up the surfaces for extra crispiness.
04 - Heat the oil or fat in a large roasting pan in the oven for 5 minutes, until shimmering hot.
05 - Carefully add potatoes to the hot oil, turning to coat each piece evenly. Add smashed garlic and herbs if using.
06 - Roast for 20 minutes, then turn the potatoes using a spatula. Sprinkle with salt and pepper.
07 - Continue roasting for another 25-30 minutes, turning once more, until golden brown and crisp on all sides.
08 - Remove from the oven and drain briefly on kitchen paper if desired. Serve hot.