01 -
Slice the beef into 1/2-inch thick strips across the grain for tenderness.
02 -
In a bowl, whisk together the soy sauce, white sugar, cornstarch, and ground ginger until the mixture is smooth and the sugar is dissolved.
03 -
Coat the beef slices thoroughly in the marinade, ensuring even coverage.
04 -
Heat 1 tablespoon of vegetable oil in a wok or large skillet over medium-high heat. Cook the beef strips in batches, stirring frequently until browned, about 3 minutes. Transfer to a bowl and set aside.
05 -
In the same wok, return the seared beef and add the red onion. Toss and cook for about 2 minutes until the onion begins to soften.
06 -
Stir in the green bell pepper and continue cooking for 2 minutes until it becomes vibrant and tender.
07 -
Add the tomato wedges to the wok and stir everything together to combine the flavors.
08 -
Serve the dish immediately. Pair with steamed rice for a complete meal.