Preheat oven to 200? / 400? /Gas Mark 6.Place the potatoes in a large saucepan and cover with water.Add salt and turmeric before bringing your potatoes to the boil and then simmer gently for 5 minutes.Drain your potatoes and toss them with the remaining ingredients; ensure all the potatoes are well coated.Turn out into a large roasting pan and pop in the oven for 30 to 40 minutes until nice and crispy.