Combine oil and soy sauce in a bowl. Rub all over beef. Heat a chargrill pan over medium-high heat. Add beef. Cook for 2 minutes each side or until coked to your liking. Transfer to a plate. Rest 2 minutes. Thinly slice.
Meanwhile, place noodles in a heatproof bowl. Cover with boiling water. Stand for 3 minutes or until tender. Drain. Refresh under cold water. Drain well.
Combine beef, noodles, tomato, salad leaves, cucumber and vinaigrette on a large serving platter. Sprinkle with mint, peanuts and chilli. Serve.