Bring a saucepan of water to the boil and add a pinch of salt. Add the egg noodles and cook for 4-5 minutes until cooked through and drain them in a collender and return to the empty saucepan. Add some light soy, toss then set aside.

Heat a wok until very hot then add the prawns. Once all of the water had drained from them, drain off the water then add the bean sprouts and whites of the spring onion plus most of the greens, but keep some aside as a garnish for later.

Add the MSG and fry for 20 seconds then add the shrimp chilli oil and stir through well to coat the beanspouts. After around 2-3 minutes add the noodles in and toss everything together. Drizzle in the sesame oil. Toss once more then remove from the heat.