The most important thing to remember for perfect potatoes is not to roast them too long in advance as they lose their crunch if you keep them waiting. Start by cutting the potatoes into even sizes then par-boil the peeled potatoes for approx. 5-6 minutes. Drain well and set aside. Shake the pot to roughen the edges.
Set oven to Gas Mark 6, 200°C (400°F). Heat some oil or fat from the turkey on the baking tray. Place the potatoes on the hot tray. Sprinkle with salt and roast for 40-50 minutes.
Shallots, roasted with the potatoes, are also delicious.