Prawn ravioli with lemongrass and ginger broth

Ingredients

• Lemongrass and ginger broth
• 2 cups chicken stock
• 2 cups water
• 2 teaspoons fish sauce
• 2 teaspoons tamarind purée
• 3 stalks lemongrass, bruised
• 3 cloves garlic, crushed
• 3 centimetre piece ginger, sliced
• 1 red chilli, sliced
• 2 spring onions, sliced
• salt and freshly ground black pepper
• Ravioli
• 300 grams raw prawn meat, finely chopped
• 1 small clove garlic, crushed
• 1 spring onion, finely chopped
• 2 tablespoons sweet chilli sauce
• 2 tablespoons chopped fresh coriander
• 1 tablespoon fish sauce
• 1 packet wonton wrappers
• 1 egg, lightly beaten
• 1 tablespoon oil
• coriander leaves, sliced chilli, to garnish (optional)