1. Prepare the onion, wash and shred the beef slices, take out for later use
2. Put the seasoning in a bowl to make a juice
3. Heat the pan with cold oil, add the onion and stir softly, pour into the bowl of juice
4. Place the fat beef one by one, cover it with a lid, and simmer until the fat beef changes color and stir-fry with the onion.
