Heat a wok or large non-stick frying pan over high heat. Add the oil, mushroom and onion and cook for 2−3 minutes. Add the chilli, garlic and pork and cook for 4−5 minutes or until the pork is well browned. Stir in the plum and soy sauces. Add the beans, cover with a lid and cook for a further 2−3 minutes or until the beans are tender. Divide between bowls to serve. Serves 4.