Preparation
Because meat is the main dish, it is most important to remove the smell of miscellaneous meat during cooking. When it is boiled, remove blood by soaking it in cold water for more than half a day, and add ingredients such as onions, green onions, pepper, garlic, ginger, and other ingredients such as rice wine. If you retrace the meat once and boil it again with all of the vegetables, you can remove some of the impurities from the meat.
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From @chusnap