If using fresh hard boiled quail eggs, peel those and place in a shallow bowl. If using canned canned eggs, drain, rinse, and place in a bowl. Add the 1 tablespoon of soy sauce and mix together. Set aside and marinate for 15 minutes.
If using canned mushrooms, drain and rinse those, and set them aside. If using fresh mushrooms, steam those to precook them, then set those aside.
In a bowl, mix together the sauce ingredients, and in a measuring cup, mix together the thickening ingredients.
Heat a wok or large pan with about ½ inch of cooking oil, while the oil is heating, take a toothpick and poke each egg a few times through the white into the yolk. The reason for this is you are going to fry the eggs in hot oil, the pricks from the toothpick should reduce the chances of an egg bursting. When the oil is hot, add the eggs and fry for a few minutes, stirring them as well until starting to brown up. Remove the eggs and drain.
Pour out the oil from the wok or pan, and return 2 tablespoons of oil back to the pan, heat and when hot, saute the spring onion until fragrant.
Add the mushrooms and the sauce to the pan and stir fry for 2-3 minutes.
Stir in the thickener then the eggs. Stir to mix together and cook until the sauce thickens. Remove from heat.
Serve as is as a side dish or serve with steamed vegetables for the light main dish.