In a bowl, combine the thinly sliced beef with light soy sauce, cornstarch, sesame oil, and white pepper. Mix well and set aside for 10 minutes.
Bring a pot of water to a rolling boil. Add macaroni and cook according to package instructions until al dente. Drain and set aside.
Heat vegetable oil in a large pot or deep pan over medium heat. Add diced onion and sauté until softened and translucent, about 3-4 minutes. Add minced garlic and sauté for another minute until fragrant.
Add tomato wedges to the pot and cook, stirring occasionally, until they start to break down, about 5-7 minutes. Stir in tomato ketchup and tomato paste, cooking for 1-2 minutes to deepen the flavor.
Pour in the beef broth. Bring the soup to a simmer, then reduce heat to low, cover, and let it gently simmer for 10 minutes to allow the flavors to meld.
Increase the heat to medium-low. Add the marinated beef slices to the simmering soup, stirring gently to separate them. Cook for 1-2 minutes until the beef is just cooked through (do not overcook).
Season the soup with sugar, salt, and white pepper to taste. Add the drained macaroni to the soup, stir to combine, and heat through for 1 minute.
Ladle the Tomato Beef Macaroni Soup into bowls and serve hot.
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