Fry the sesame seeds in a dry wok over a medium heat, stirring until golden. Set aside.
Heat half the oil in a wok over a high heat until the oil starts to shimmer. Add half the pork and stir-fry for 2 minutes until golden. Remove the pork using a slotted spoon and set aside. Heat the remaining oil and stir-fry the rest of the pork in the same way, then return the first batch of pork to the wok.
Add the broccoli, mushrooms and leeks and stir-fry for 2 minutes. Add the rice wine, oyster sauce, malt vinegar, sugar and honey and cook for 1 more minute. Remove from the heat, stir in the toasted sesame seeds, sesame oil and chilli, and serve.