My top tip for the perfect roast potatoes is to let the potatoes steam dry for a few minutes before adding them to the oily roasting dish. I also make sure to use really good quality extra virgin olive oil to give it the best flavour possible. It is vital that you preheat the oil before adding the potatoes so that they help creating a crispy skin. During Christmas time you could replace oil with goose fat.
Remove and serve straight away.