Preheat the oven to 200oC, 400oF, Gas Mark 6.
Parboil the potatoes for 68 minutes, drain and return to the pan. Drizzle the oil into a roasting tin and heat in the oven for a few minutes.
Meanwhile, sprinkle the sachet contents over the potatoes and shake the pan to coat evenly. Spread the potatoes onto the preheated roasting tin and cook for 45 minutes, or until golden brown and crispy, turning halfway through.
Delicious with roast turkey and all the trimmings. Try replacing the oil with beef or goose fat for extra flavoursome potatoes.