For the pork, pour 700ml/1¼ pints water into a large pan, add the pork and bring to the boil. Boil for 30 minutes. Drain and leave to cool.
Transfer the meat to the fridge for an hour, to firm up.
Meanwhile, for the pickled cucumber, combine the garlic, sugar, vinegar, chilli bean paste, chilli oil and sesame oil in a bowl.
Add the cucumbers and leave to marinate in the fridge for 20 minutes.
Remove the cucumbers from the fridge and add the fresh chilli.
Remove the meat from the fridge and slice into 5mm/¼in thick slices.Heat a wok over high heat and add the groundnut oil, then the pork. As the pork starts to brown, add the rice wine (or sherry) and cook until the pork has browned and the skin is slightly crisp.
Add the chilli bean paste, yellow bean sauce and fermented black beans and stir-fry for a minute.
Add the spring onion (or leek) if using, and stir-fry for less than a minute until well mixed.
Add both soy sauces and the sugar, season and serve.
To serve, place a spoonful of rice onto the plate, spoon the pork over the top then the pickles alongside.