Peel the potatoes and cut them into thin, julienne-like shreds. You can use a knife or a julienne peeler. Place them in a large bowl of cold water for about 10 minutes to remove excess starch.
Bring a pot of water to boil; add one tablespoon of white vinegar. Add the soaked potato to blanch water for about 30 seconds. Drain with a slotted spoon and pat them dry with paper towels.
Heat the vegetable oil in the wok over high heat. Add the Sichuan peppercorns, minced garlic, and dried red chili peppers. Cook them for about 20 seconds, stirring frequently, until they become fragrant. Be careful not to burn them.
Add the shredded potatoes and continue stir-frying for about 2-3 minutes. Sprinkle some water to make sure the potato from drying out. The potatoes should become slightly translucent and turn golden at the edges.
Add in the green onions—Drizzle with light soy sauce, black rice vinegar, and a pinch of sugar over the potatoes. Toss everything together for another 1or 2 minutes until the potatoes are fully cooked and have absorbed the flavors. Add salt and black pepper to taste.
Transfer the Sichuan Chinese shredded potatoes to a serving plate and enjoy!