Prepare the crabs (see
Heat the oil in a wok or large frying pan and stir-fry the curry paste over a medium heat for 3–4 minutes or until fragrant.
Add the crab and onion and stir-fry for 7–8 minutes or until the crab meat is cooked. Add the coconut milk, egg, fish sauce and spring onions and continue stir-frying for 2–3 minutes. Taste and adjust the seasoning.
Spoon on to a warm serving plate.