Bring a medium pot of water to boil, drain the potato preciously soaked under water.
Boil the shredded potato for about 1 minute, stir occasionally, drain well and set aside.
Heat a pan over high heat, add cold oil and toss in the Szechuan peppercorn and dried chili pepper, saute 2-3 minutes or until fragrant.
Carefully add the potato to the pan, stir-fry for about 1 minute, add green onion, salt, soy sauce and rice vinegar, keep stir-frying for another 2-3 minutes, making sure the seasonings are spread evenly.
Remove from heat, transfer to a plate and serve.
Notes
Rinse the shredded potato under running cold water helps to wash off the starch on the surface. Soak the potato under cold water helps to 1) keep them from oxidizing, 2) keeps the potato stay crispy. Boil the potato with hot water first will reduce the time for stir-frying.