In a hot wok, add the prawns and stir fry until prawns begin to change colour.
Add garlic, red shallots, pepper, shrimp paste, chile and spring onions and stir fry for a further minute.
Garnish with coriander (cilantro) and chile.
For the marinade:
In a mixing bowl, combine the sugar, fish sauce, and chile powder and marinate the prawns for 20 minutes.