Step 1

Combine the beef, peanut oil, lemon grass, ginger and garlic in a large bowl. Cover and set aside to marinate for 5 minutes.

Step 2

Bring a large saucepan of water to the boil. Add the noodles and cook for 3 minutes or until just tender. Drain and cover to keep warm.

Step 3

Meanwhile, heat a large wok over high heat until just smoking. Add 1/4 of the beef mixture and stir-fry for 1 minute or until the beef just changes colour. Remove from the wok. Repeat with the remaining beef mixture in 3 batches, reheating the wok between each batch.

Step 4

Add the beans to the wok and stir-fry for 1 minute. Add 1 tablespoon of the lime juice, cover and cook for 1 minute or until the beans are bright green. Return all the beef and any juices to the wok with the cooked noodles, bean sprouts, mint, coriander, remaining lime juice and kecap manis. Toss until well combined and just heated through. Season with salt and pepper