Peel the potato then cut it into julienne strips. You may use a food processor or a julienne peeler to achieve similar results (regular grater is not recommended).
Rinse the potato strips under tap water to remove excess starch. Drain them very well.
Heat up a wok on a high heat. Pour in the oil, then add dried chilli and Sichuan peppercorn. Leave to sizzle until fragrant (do not burn them).
Put fresh chilli, garlic and potato strips into the wok. Stir fry constantly until the potato is cooked (should be still a bit crunchy).
Add black rice vinegar and salt . Give everything a quick stir then dish out.
Serve it warm with rice, along with other meat/vegetable savoury dishes.