01 - Using a mandoline or sharp knife, slice the potatoes into very thin rounds about 1/16 to 1/8 inch thick.
02 - Rinse the potato slices in cold water to remove excess starch, then drain and pat thoroughly dry with clean kitchen towels or paper towels.
03 - Heat the oil in a deep, heavy-bottomed pan or deep fryer to 340°F.
04 - Working in small batches, carefully add potato slices to the hot oil. Fry for 2-3 minutes, turning occasionally, until golden and crisp.
05 - Remove chips using a slotted spoon and drain on a paper towel-lined tray. Immediately sprinkle with sea salt and pepper if using.
06 - Allow to cool completely for maximum crispness. Store in an airtight container if not serving immediately.