Marinade: 1 lb flank steak 1 Tbsp cornstarch 1/2 tsp baking soda 1 Tbsp osyster sauce 1 tsp regular soy sauce 1 tsp oil 1 tsp ginger & garlic Sauce: 1 cup chicken/beef broth 2 Tbsp soy sauce 1 Tbsp oyster sauce 1 tsp dark soy sauce 1 tsp sesame oil 2 Tbsp brown sugar White pepper 2 Tbsp Shaoxing wine (optional) Cornstarch slurry to thicken