Marinate the beef slices with the Marinade for 30 minutes. Heat up a wok with 1 tablespoon of oil and stir-fry the marinated beef until they are half-done. Dish out and set aside.
Heat up the remaining 1 tablespoon of oil and stir-fry the garlic and ginger until aromatic. Add the beef back into the wok and then the sauce. Continue to stir-fry until the beef slices are almost done, then add the scallions. Do a few quick stirs. Dish out and serve hot over steamed white rice.