In a frying pan, add butter and cook the prawns for 1-2 minutes on each side until they are pink and well cooked. Keep them aside.
In a bowl, add corn flour and water to make a slurry.
Separate the egg whites and yolks.
Whisk egg whites to frothy. This will takes less than a minute. Whisk the yolks too.
Add the yolks into the whites and whisk again. Add the remaining ingredients (except oil) and whisk again to see the frothy bubbles.
In a wok/large frying pan, add oil and let it heat up on a high flame. Add the egg mixture, with seconds the sides start to cook and puff up. Now lift the pan from the flame. Use the spatula to pick the cooked layer and place / stack on one side. Place the pan again on the flame and repeat the process to cook the uncooked eggs. All of this takes less than a minute.
Transfer to a plate. Garnish with prawns, spring onion greens/chives and sesame seeds.