Cook the noodles according to the instructions on the packet.
Heat a wok or large frying pan and lightly spray with oil. Add the spring onions, red pepper, lime leaves, chillies and lemon grass and stir-fry for 1 minute. Add the shredded pork and stir-fry over high heat for 2 minutes.
Add the soy sauce, fish sauce, sugar and drained noodles and cook for about 2 minutes, using 2 spoons to lift and stir until the noodles are evenly coated and hot.
Serve immediately, garnished with basil leaves and shredded spring onions.