Boil the kettle. Place the rice noodles in a large bowl and cover with the boiled water. Cover with some film and leave for 5 mins or until tender. Drain and rinse under cold water to prevent them sticking together. They will heat up again when you add them to the stir fry.
Heat a griddle pan until smoking. Spritz the steak with a little olive oil and season with salt and pepper. Place the steak onto the griddle pan and grill for 1-2 mins on each side. This will give you a nice medium rare steak. If you like it more or less cooked change the cooking time accordingly, but remember that when you add the steak to the stir-fry it will cook a little more. Remove from heat and leave to rest for 5 mins. Slice thinly widthways.
For the sauce
Mix the sauce ingredients together.
Heat a wok. Add 1 tsp olive oil and throw in the spring onions, shitake mushrooms, broccoli and peppers and stir-fry for 2 mins. Pour over the sauce, add the noodles, basil and steak, give a big stir until combined and serve topped with chilli.