01 - Cut potatoes into 1/4-inch thick sticks. Soak in cold water for at least 30 minutes to remove starch. Drain and pat dry thoroughly with paper towels.
02 - Heat vegetable oil in a deep fryer or heavy-bottomed pot to 325°F (165°C).
03 - Fry potatoes in batches for 4–5 minutes until pale and tender but not browned. Remove with slotted spoon and drain on paper towels.
04 - Raise oil temperature to 375°F (190°C) for second frying.
05 - Fry potatoes in batches for 2–3 minutes until golden and crispy. Drain on fresh paper towels.
06 - Immediately season with sea salt and serve hot.