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.