Hot and sour noodle soup

Ingredients

• 100 g egg noodles
• 100 g cooked prawns
• 150 g fresh shiitake mushrooms
• 60 g baby corn
• 4 spring onions
• 20 g ginger and thinly
• 3 cloves garlic thinly
• 2 red chillies de-seeded and
• 1 tsp dried chilli flakes
• 5 cm piece of lemon grass roughly
• 2 Tbsps fish sauce
• 1 Tbsp rice wine vinegar
• 2 tsps light soy sauce
• 1.5 liter water
• 1 chicken stock cube
• 1 handful fresh coriander