Chinese stir-fried potato with mountain pepper

When I travelled through China, I ate stir-fried potato with Sichuan pepper and adored it. This is a variation of that classic dish, using local potatoes and indigenous mountain pepper, also known as native pepperberries, and I think it’s just as good. If you like a bit of extra heat, add a little sliced fresh red chilli to the wok when adding the pepperberries.