Beat the eggs in a bowl. Beat for a long time to incorporate plenty of air; there should be lots of bubbles on the surface. Add the rest of the ingredients and beat again.
Heat the oil in a small, deep wok. The oil has to be VERY hot and the diameter of the wok or pan has to be small so that the omelette doesn't spread out too much.
Pour the egg and prawn mixture into the oil. The omelette will bubble up.