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Heat enough water to cover the pork in a saucepan or wok. When the water is boiling furiously, add the meat and skim the surface after a few seconds. Throw in the sichuan peppercorn, ginger and spring onions, bring back to the boil and then turn the heat down. Simmer until the meat is just cooked – 20 minutes, depending on its thickness. Drain and allow it to cool. You can see whether it's ready by poking a skewer into the thickest part – if no pink juices ooze out, it's properly cooked.