Add 2 tbsp oil to a pan and heat up to medium-high. Wait for 1 minute. Pour in beaten eggs and mix or scramble. Cook for 3 minutes or until done. Remove the eggs and set aside.
Add another 2 tbsp oil to the wok. Place the marinated beef in and cook for 3-5 minutes or until no longer pink (cook up to 75% and do not over cook them). Remove the meat and set aside.
Add another 2 tbsp oil to the wok. Place the chopped onion and cook for 1-2 minutes or until translucent. Add minced garlic and cook for 30 seconds or until fragrant.
Add cold cooked rice, sauce mixture and mix well or until well coated with the sauce. Place vegetables in and mix well. Return the beef and mix. Then return the cooked eggs. Use the spatula to break up the eggs and mix/stir.
Turn off the heat. Add chopped green onions and mix. Remove the wok from the heat.