Marinate the Beef :

In a small bowl, toss the thinly sliced beef with soy sauce, oyster sauce, and sesame oil. Let it marinate for 15-20 minutes while preparing the other ingredients.
Stir-Fry the Beef :
2. Heat a large pot or wok over medium-high heat. Add the marinated beef and stir-fry for 2-3 minutes, or until browned and cooked through. Remove the beef from the pot and set it aside.

Prepare the Soup Base :
3. In the same pot, add a little more sesame oil if needed. Add the sliced onion and cook for 3-4 minutes until softened. Stir in the minced garlic and grated ginger, cooking for another 1-2 minutes until fragrant.

Build the Soup :
4. Pour in the beef broth and bring to a simmer. Add the shredded cabbage, sliced carrots, and ground black pepper. Stir to combine, and let the soup simmer for 10-12 minutes, until the vegetables are tender.

Add the Beef :
5. Return the cooked beef to the pot and let it simmer for an additional 5 minutes to heat through and allow the flavors to meld. Taste and adjust seasoning with salt and red pepper flakes if desired.

Serve and Garnish :
6. Ladle the soup into bowls, and garnish with fresh cilantro or chopped green onions. Serve with lime wedges for a burst of fresh flavor.

Serving Suggestions :
This hearty and savory Stir-Fried Beef and Cabbage Soup is perfect for a comforting meal. Pair it with steamed rice or crusty bread to soak up the flavorful broth.