In a large wok or frying pan, heat the oil and cook the onion and chilli for 3 minutes. Then add the pork and squash ribbons and cook for 2 minutes.
Add the mixed vegetables and mange tout and cook for another 2-3 minutes before adding the soy sauce and hoisin and garlic sauce. Cook for a further 3 minutes.
Meanwhile, bring a large pan of water to the boil and cook the noodles for 3-4 minutes until tender, then drain.
Stir the noodles into the vegetables and serve immediately.