In a mixing bowl combine the prawns, fish sauce, sugar, oyster sauce, cinnamon, cumin and curry powder. Allow to marinate for 30 minutes, covered and refrigerated.
Pour oil in a large fry pan on high heat, fry the ginger, garlic and red shallots until fragrant and then cook each side of the prawns for 1 minute. Add the spring onions and 1 tablespoon of water and toss for a further minute.
Transfer to a serving plate and garnish with sliced red chili.