Step 1

Place the noodles in a heatproof bowl and cover with plenty of boiling water. Set aside for 5 minutes or until noodles are tender. Drain well.

Step 2

Heat oil in a wok over high heat. Add one-third of the beef and stir-fry for 2 minutes or until brown. Transfer to a heatproof bowl. Repeat, in 2 more batches, with the remaining beef.

Step 3

Add the onion, lemon grass and ginger to the wok and stir-fry for 2 minutes or until onion softens. Return beef to the wok with the beans and stir-fry for 1 minute. Add the noodles, sweet chilli sauce, fish sauce and lime juice and stir-fry for 1-2 minutes or until heated through. Divide the noodles among serving bowls and serve with lime wedges.