2. Use sour plants to nourish the meat:

The sour ingredients in fruits or spices such as lemon, orange will decompose the beef, making the beef softer when processed.
Note, when using this method, do not rub the beef for too long, it will make them too soft, even dry after processing, losing the natural flavor of the beef. The time to tenderize meat this way should only be 15 – 20 minutes, you can put the meat being massaged in the refrigerator to increase the depth without affecting the quality and flavor of the meat much. In addition, people also use dry tea leaves in filter bags, drop them into the beef viscera while cooking, the meat will become softer when cooked.