1 bunch of choy sum, trimmed, cut into 5cm lengths
Heat a chargrill pan over high heat. Lightly spray the beef with olive oil and season all over with salt and pepper. Cook steaks for 2 min each side for medium rare or until cooked to your liking. Remove, rest for 5 min then thinly slice.
Place the chicken stock, star anise, julienned ginger, red chilli, cooking wine and light soy sauce into a large saucepan and bring to the boil. Reduce heat to medium- low and simmer for 8 min.
Meanwhile, cook the dried noodles in a large saucepan of boiling water according to packet directions. Drain and refresh under cool water and divide between serving bowls.
Add choy sum to the soup and cook for a further 1-2 min or until just tender. Ladle the soup over noodles and top with sliced beef. Garnish with garlic chives, a drizzle of sesame oil and season with ground black pepper if desired.