Boil some water in a pan with a steaming rack.
Meanwhile, beat the eggs together with the salt and 1 tsp oil.
Add the water to the beaten egg and mix well.
Pour the mixture slowly through a strainer into a dish to remove the froth.
Place the dish of egg mixture onto the steaming rack, put the lid on but leaving it slightly ajar.
Reduce heat to medium-high and steam for 10 minutes.
Remove from heat and sprinkle the green onions on the cooked eggs.
Heat the remaining3 tsp of oil, pour over the eggs, and then add the soy sauce.