01 - Cut the peeled potatoes into sticks approximately 3/8 inch thick.
02 - Immerse the cut potatoes in cold water mixed with white vinegar for 30 minutes to 2 hours to remove excess starch and improve crispness.
03 - Drain and rinse the potatoes thoroughly, then pat them dry with paper towels to remove all moisture.
04 - Heat vegetable oil in a deep fryer or heavy pot to 320°F and fry the potatoes in batches for 4 to 5 minutes until pale and tender but not browned; remove and drain on paper towels.
05 - Increase oil temperature to 375°F and fry the potatoes again in batches for 2 to 3 minutes until golden brown and crispy; drain on fresh paper towels.
06 - Immediately sprinkle with additional salt to taste and serve hot.