Preheat oven to 400°F
Use a sharp knife to cut the potatoes crosswise into ⅛-inch-thick slices, stopping when your knife reaches butter knives or chopsticks so that the potato stays intact at the bottom. Repeat with remaining potatoes
Place all ingredients in a roasting pan, mix well and add potatoes cut side down
Roast for 20 minutes. Turn potatoes and roast for a further 25 to 30 minutes until the liquid is mostly absorbed and you're left with mainly oil in the pan
Optional: Flip potatoes cut side up and roast for another 30 minutes to crisp
Remove from oven. Baste potatoes with the reduced sauce, garnish with parsley, and serve
