Place all chopped ingredients and diced prawns into a mixing bowl. Add soy sauce, sugar and sesame oil . Mix everything together.
Set up the wrapping station – a clean bench, a small bowl of water and wonton wrappers. Wrap the wontons by following these simple instructions: a)Place 1 tsp of prawn mixture onto the centre of the wrapper. Using the index finger, lightly wet all sides. b) Fold the bottom corner over the mixture to the top to form a triangle. Press to seal all sides. c) Take the 2 corners of the triangle at the base and pull them towards each other, one to overlap the other. d) Lightly wet the tip and press them together to secure.
Place wontons in a deep bowl. Bring the chicken stock to a simmer in a saucepan, stir in the oyster sauce and chilli oil. Taste and adjust. Then pour the chilli broth over the wontons.
Set up the wok to steam. Once the water is boiling, place the bowl in the wok, cover and steam for 8 minutes, or until cooked through. Remove, garnish with chopped coriander and serve hot.