Ingredients
Vegetable oil, for stir frying
1 1/2 tablespoons oyster sauce
2 cloves garlic, finely minced
1 small onion, cut into 1-inch pieces
1-2 bell peppers, cut into 1-inch pieces (any colors)
1 pound beef, thinly sliced (sirloin, flank are best)
1 teaspoon corn starch
freshly ground black pepper
1/2 teaspoon vegetable oil
1 teaspoon low sodium soy sauce
1 egg white
Step by step
In a bowl, whisk together the egg white, low sodium soy sauce, vegetable oil, black pepper and corn starch. Add the beef slices and mix very well. Marinate for 10 minutes.
Heat a wok or large sauté pan over high heat. Swirl in about 1 tablespoon of vegetable oil. When very hot, add in the beef slices, spreading it out all over the surface of the pan. Let cook for 30 seconds, undisturbed, to get a nice sear. Flip the slices and cook another 30 seconds. Remove immediately to a clean plate.
Turn the heat down to medium-high. If needed, add in just a little more vegetable oil. Add in the bell peppers and the onion and stir-fry for 1 minute. Push the vegetables aside and make a little spot for the garlic. Add in the garlic and give it a few seconds to heat up and become fragrant. Toss garlic in with the vegetables.
Add the beef back into the pan. Toss very well. Pour in the oyster sauce and toss again. Season with more black pepper, if desired.