Peel the prawns and discard the shells. Using a small sharp knife, remove the fine digestive cord. Wash the prawns in cold water and pat them dry with kitchen paper.
Heat a wok or large frying pan until it is very hot, add the oil, and then add the garlic, shallots and cumin seeds and stir-fry for 5 minutes or until well toasted. Then add the shrimp paste and curry paste and stir-fry fo