Lay the salmon fillets on a platter. Put all the spices in a small bowl and mix well. Sprinkle the spice mixture evenly on both sides of the salmon fillets.

Heat a wok or frying pan over a high heat. Add the oil and, when the oil is hot and slightly smoking, add the salmon fillets and sear on one side for 3–4 minutes. Turn over and sear the other side for another 3–4 minutes. Transfer the salmon to a warm platter. Garnish with the spring onions and serve at once.