– 10 oz. beef tenderloin, thinly sliced – ▢2 1/2 tablespoons cooking oil – ▢1/2 onion (sliced) – ▢3 cloves garlic (thinly sliced) – ▢3 stalks scallion (cut into 2-inch strips) Marinade: – ▢1 teaspoon corn starch – ▢1 teaspoon soy sauce – ▢1 teaspoon Chinese Shaoxing wine or dry sherry Sauce: – ▢2 teaspoons oyster sauce – ▢2 tablespoons soy sauce – ▢1/4 teaspoon dark soy sauce – ▢3 dashes white pepper powder – ▢1/4 teaspoon sesame oil – ▢1 tablespoon sugar – ▢1 pinch salt