Slice beef to desired thickness. Mix with egg whites and tapioca powder, set it aside for 30 minutes for beef to tenderize
In another bowl, mix in water, sugar, ketchup, hoisin sauce, oyster sauce, thai chili sauce, crushed red pepper and rice vinegar
Coat the beef slices with taipioca powder, and deep fry it with medium high heet until golden brown and set it aside.
Discard the extra oil and only leave proper amount of oil in the pan, add in green bell pepper, red bell pepper, onion and garlic. Stir fy it until onion becomes translucent
In the same pan, add in the condiment mixture and bring to boil, add in the vegetable mix and beef, mix property and ready to serve.