Ingredients
For the Marinade:1 pound beef sirloin or flank steak, thinly sliced against the grain2 tablespoons soy sauce1 tablespoon oyster sauce1 teaspoon cornstarch1 teaspoon sesame oilFor the Stir-Fry:2 tablespoons vegetable oil1 large onion, sliced1 red bell pepper, sliced1 green bell pepper, sliced2 cloves garlic, minced1 teaspoon fresh ginger, gratedFor the Sauce:1/4 cup soy sauce2 tablespoons hoisin sauce (optional)1 tablespoon cornstarch mixed with 2 tablespoons water (slurry for thickening)1/2 teaspoon black pepper (or more, to taste)1/4 teaspoon red pepper flakes (optional, for spice)
Preparation
Step 1: Marinate the BeefIn a bowl, mix the soy sauce, oyster sauce, cornstarch, and sesame oil.Add the beef slices to the marinade and toss to coat evenly. Let sit for at least 15 minutes (up to 30 minutes for deeper flavor).Step 2: Prepare the SauceIn a small bowl, whisk together the soy sauce, hoisin sauce (if using), black pepper, and the cornstarch slurry. Set aside.Step 3: Stir-Fry the VegetablesHeat 1 tablespoon of vegetable oil in a large skillet or wok over high heat.Add the onion and bell peppers. Stir-fry for 2–3 minutes, until slightly softened but still crisp. Remove and set aside.Step 4
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