In a large bowl, combine thinly sliced beef with garlic, regular soy sauce, dark soy sauce, Shaoxing wine, cornstarch, black pepper, sugar, baking soda, and vegetable oil. Let marinate for 15 minutes.In a separate small bowl, mix together the oyster sauce, dark soy sauce, regular soy sauce, black pepper, Shaoxing wine, cornstarch, and chicken stock to create the sauce. Set aside.Heat a wok or large skillet over medium-high heat and add the vegetable oil.Quickly fry the marinated beef for about 1–2 minutes until just cooked through. Remove the beef and set aside.In the same pan, sauté the julienned onions and diced red and green bell peppers for about 30 seconds until slightly tender but still crisp.Pour the prepared sauce into the pan and let it simmer and thicken for about 1–2 minutes.Return the cooked beef to the pan and toss everything together until well coated and heated through.Serve immediately with your choice of rice or noodles for a complete meal.