Preparation
Wash, peel, and cut the potatoes into chips, 1.5 cm thick. Boil them in water till semi-cooked. Remove them from the water, and transfer to a towel; pat dry, and then leave them to cool. Heat the oven to 350 °F. Pour a tablespoon of olive oil into a large, shallow non-stick roasting tray, and heat it for 10 minutes.