Nutrition: Per serving
Tip the potatoes into a pan of cold, salted water. Bring to the boil, then reduce to a simmer and cook for 7-8 mins until just cooked through. Drain and leave to cool. Will keep covered and chilled for two days.
Heat the oven to 200C/180C fan/ gas 5. Tip the oil into a deep roasting tin to cover the base, then transfer the tin to the oven for 5 mins to heat up. Carefully add the potatoes using a spatula and gently turn to coat in the hot oil. Roast for 40 mins without opening the oven door.
Remove the tin from the oven and scatter over the paprika and thyme. Turn the potatoes so they are evenly seasoned and drizzle with more oil if the pan is dry. Return to the oven for 20 mins, turn again, drizzle over more oil if needed, and roast for another 15-20 mins until deeply golden and crunchy on the outside, and fluffy inside. Tip into a serving dish, season with sea salt and serve.
