Stir-fry chunks of tofu instead of prawns, or add extra veg such as water chestnuts or shredded bok choi.
Heat the oil in a wok or frying pan and stir-fry the prawns on a high heat for 30 secs until they start to take on a little colour. Tip in the ginger, bean sprouts and half of the spring onions and stir-fry for another 30 secs, then turn down the heat and pour in the eggs.
Leave to set for a few seconds, then move the loosely-set egg around the pan with a spatula to scramble. When all of the egg has set, tip in the soy sauce and let it sizzle for a few seconds. Serve sprinkled with the rest of the shredded spring onion and season with more soy sauce to taste.