Add cooking oil and Sichuan peppercorns to a cold wok. Sizzle over high heat until fragrant (do not burn). Remove the peppercorns with a slotted spoon and discard.
Fry ginger, garlic and dried chillies in the oil briefly then stir in cabbage.
When the cabbage wilts, add soy sauce, black rice vinegar, salt and sugar.
Stir fry for a further 20 seconds or so. Dish out and serve warm.