Prepare the garlic oil first by heating up your wok and stir fry the minced garlic until they turn light brown. Dish out and set aside.
Heat up a pot of water and bring it to boil. Add two small drops of cooking oil into the water. Drop your vegetables into the boiling water and quickly blanch them for about 20-30 seconds (depends on the quantity). As soon as they turn slightly wilted, transfer them out and drain the excess water off the vegetables. Arrange the vegetables on a plate.
In a wok, heat up the cooking oil, and then add the oyster sauce, water, sugar, and white pepper powder. As soon as the sauce heats up and blends well, transfer and drench it over the balanced vegetables. Top the vegetables with the garlic oil and serve immediately.
For the garlic oil, the garlic will continue to cook in the oil so as soon as they turn light brown in the wok, you should dish it out. Eventually, they will turn golden brown.