Step 1

Place noodles in a large heatproof bowl, cover with boiling water; stand 5 minutes or until tender, drain.

Step 2

Heat half the oil in wok; stir-fry beef, in batches, until browned. Remove from wok.

Step 3

Heat remaining oil in wok; stir-fry lemon grass and garlic until fragrant. Return beef to wok with juice and sauce; stir-fry until heated through. Add noodles; stir-fry until combined. Stir in remaining ingredients; serve immediately.