Prep the pan – Preheat the oven to 220°C (425°F) (200°C/400°F fan-forced) and preheat the roasting pan in the oven too.
Prep the potatoes – Peel the potatoes and cut them into quarters. Cut large potatoes into eighths.
Boil the potatoes – Place the potatoes in a large pot and cover them with water. Place the pot over high heat. Once the water starts to boil rapidly, turn it down to a simmer and boil for 2 minutes.
Heat the roasting pan – While the potatoes are cooking, add the olive oil to the preheated roasting pan in the oven.
Flour the potatoes – Drain the potatoes in a colander and shake them around to rough up the edges. Add the 2 teaspoons of flour and stir to coat the potatoes as evenly as possible.
Roast – Add the potatoes to the roasting pan. Turn the potatoes, so they are evenly coated in the oil. Add the salt. Place the pan in the oven and bake the potatoes for 15 minutes. Turn them over, then cook again for 15 minutes. Continue this process until your potatoes are perfectly crisp.
Serve – Sprinkle the potatoes with extra salt and serve.