I'd like to pay this cheque in, please topamax generic brands To prepare the roast potatoes, preheat the oven to 220C/425F/Gas 7. While the oven is reaching the correct temperature, bring a pan of salted water to the boil. Add the potatoes, return the water to the boil and blanch them for eight to 10 minutes until cooked through and tender. Drain them through a colander in the sink and leave to steam-dry for a couple of minutes. Be careful not to break them up too much.