Step 1: Prepare the Beef

1. Marinate the Beef:
   • In a medium bowl, combine the sliced beef with 2 tablespoons soy sauce, 1 tablespoon oyster sauce, and a pinch of salt.
   • Mix well and let it marinate for 15 minutes while preparing other ingredients.

Step 2: Cook the Soup

1. Sauté the Beef:
   • Heat 1 tablespoon sesame oil in a large pot over medium heat.
   • Add the marinated beef and sauté until browned, about 2–3 minutes. Remove the beef and set aside.
2. Cook the Tomatoes:
   • In the same pot, add the chopped tomatoes and cook for 5 minutes, stirring occasionally, until they soften and release their juices.
3. Add the Broth:
   • Pour in the 4 cups of beef broth and bring the mixture to a simmer.
   • Return the sautéed beef to the pot and let it cook for an additional 5 minutes.

Step 3: Add Noodles and Eggs

1. Cook the Noodles:
   • Add the noodles directly to the simmering soup. Cook according to package instructions, usually 3–5 minutes, until tender.
2. Add the Eggs:
   • Slowly pour the beaten eggs into the soup in a steady stream while gently stirring with a fork or chopsticks to create ribbons of egg.

Step 4: Serve

1. Season the Soup:
   • Taste the broth and adjust seasoning with additional salt and pepper, if needed.
2. Garnish and Serve:
   • Ladle the soup into bowls and top with chopped green onions for a fresh, aromatic finish.