Heat the oil in a wok or deep-sided frying pan, add the onion and fry for 3-4 minutes until golden. Add the prawns and continue stir-frying for 3-4 minutes until they turn pink, then stir in the noodles and toss for 3-4 minutes.
Add the beaten eggs and stir-fry quickly to distribute, then stir in the bean sprouts, sugar, fish sauce, lime juice and chilli sauce. Stir-fry for a further minute, then stir in the peanuts and coriander before serving on a large, warm platter.
It's a little princess!