For beef, mutton and other meat with strong smell, don't forget to put pepper when cooking. Like boiled beef and mutton in white water, Chinese prickly ash must be put to improve freshness and remove mutton smell.
Add more ginger to fish. Fish is cold. It needs hot substances like ginger to regulate it. Like steamed fish, you should eat crabs with shredded ginger and dip them in vinegar and chopped ginger. In addition, some ginger should also be put into seafood with cold nature, such as shellfish (such as snail, clam, crab, etc.).
Why put onions, ginger and garlic in the boiling water
It's rare to put onions, ginger and garlic in the water. I have been a cook for more than ten years. No such operation has been done. If any, it may be to eliminate fishiness. I wonder if you are satisfied with this answer