Heat up a wok with oil, stir fry the ginger and garlic first then add beef and stir-fry for 1 minute. Remove it from the wok and place aside. Wash the wok and dry it. Heat up a little bit of oil and stir fry the broccoli for 20 seconds then add the beef back in the wok and keep stir fry for further 30 seconds. Stir in potato starch water and cook for 20 seconds. Add salt to taste and itâs ready to serve. This dish is great to serve with hot white rice.