Hot and sour prawn soup

Name: Hot and sour prawn soup
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Cuisine: Asian
Ingredients: 1/2 bunch coriander; 6 cups (1.5 litres) fish stock; 6 kaffir lime leaves; 2 stalks lemongrass, white part only, thinly sliced; 3cm piece ginger or galangal, peeled, cut into matchsticks; 2 garlic cloves, thinly sliced; 500g green king prawns, peeled, deveined, leaving tails intact; 1/3 cup (80ml) lime juice; 2 tbsp fish sauce; 100g enoki mushrooms, trimmed; 1 long fresh red chilli, seeded, thinly sliced (see tip); 1 cup (55g) beansprouts; 2 green onions, trimmed, thinly sliced lengthways