01 - Preheat oven to 430°F. Place large roasting tray inside to heat up while preparing potatoes.
02 - Place peeled potato chunks in large saucepan. Cover with cold water and add 1 tbsp salt. Bring to boil, then simmer 8-10 minutes until edges begin to soften but centers remain firm.
03 - Drain potatoes thoroughly in colander. Let steam dry for 2 minutes. Return to pan and shake vigorously to roughen surfaces, creating crispy edges during roasting.
04 - Carefully pour hot oil or duck fat over potatoes. Toss gently to coat evenly, ensuring all pieces are lightly covered.
05 - Remove heated roasting tray from oven. Carefully transfer potatoes into tray, spreading in single layer without overcrowding. Add crushed garlic and herb sprigs if desired.
06 - Roast at 430°F for 20 minutes until bottoms begin to golden.
07 - Turn potatoes using metal spatula. Roast additional 20-25 minutes, turning once more if needed, until deep golden brown and crispy all over.
08 - Remove from oven. Sprinkle with sea salt flakes and fresh black pepper. Serve immediately while hot and crispy.