It's simple. As long as there are onions and garlic in the menu you see, just don't put them yourself. Chinese food is not so particular. You don't have to put things, and you don't have to put things. As you said, you can put onions in scrambled eggs and tomatoes. Recipes with different ingredients or seasonings are another taste. To give a simple example, preserved eggs mixed with tofu can be mixed with shallots, garlic paste and coriander, and both can be mixed or not, just for a different taste.