Method:

1. Heat a wok over high heat, add 1/2 the oil and beef strips, in batches, for 2 minutes.
2. Transfer to a plate. Heat remaining oil in the wok and add onion, garlic and pepper, stir fry for 2 minutes or until, onion is softened. Add beans and bok choy to the wok and stir fry a further 3 minutes.
3. Combine soy sauce, sugar and hoisin sauce in the wok with 2tbsps cold water and toss to combine well.
4. Return beef to the wok with the noodles, tossing again to combine and serve garnished with lime wedges, sliced red chilli and fried shallots if desired.