Pork aubergine noodle stir fry

Name: Pork & aubergine noodle stir-fry
Ingredients: ½ tbsp groundnut oil; 100g lean pork mince; 1 aubergine, cut into small cubes; 2 nests medium egg noodles (about 100g); 1 tbsp low-salt soy sauce; 3 tbsp rice vinegar; ½ tbsp cornflour; large piece of ginger, peeled and 1/2 grated, 1/2 cut into matchsticks; 3 garlic cloves, crushed; ½-1 red chilli, finely chopped; bunch of spring onions, finely sliced; 2 pak choi, leaves separated or sliced