Instructions:
- Marinate the Beef:
- In a bowl, combine the soy sauce, cornstarch, oyster sauce, sesame oil, sugar, and black pepper.
- Add the thinly sliced beef to the marinade, mix well, and let it marinate for at least 15-20 minutes (you can also marinate it for a few hours for more flavor).
- Prepare the Stir-Fry:
- Heat the vegetable oil in a large skillet or wok over medium-high heat.
- Add the marinated beef to the pan and stir-fry for 2-3 minutes until browned. Remove the beef from the pan and set aside.
- Cook the Onions:
- In the same pan, add a little more oil if necessary, and toss in the sliced onions. Stir-fry the onions for 3-4 minutes until they soften and become slightly translucent.
- Add the minced garlic and ginger to the onions and sauté for another 30 seconds until fragrant.
- Combine and Finish:
- Return the beef to the pan with the onions and garlic. Add soy sauce, oyster sauce, hoisin sauce (if using), and chili flakes. Stir-fry everything together for another 1-2 minutes to combine the flavors.
- Garnish and Serve:
- Once everything is cooked through, remove the pan from heat.
- Garnish with chopped green onions and sesame seeds.
- Serve the stir-fry over steamed rice or noodles.
Optional Add-Ins:
- Vegetables: Feel free to add bell peppers, mushrooms, broccoli, or carrots to the stir-fry for more texture and color.
- Noodles: You can stir-fry some noodles along with the beef and onions for a more hearty meal.
Enjoy this quick and savory beef and onion stir-fry that’s full of rich flavors and perfect for dinner!