Mongolian Beef and Spring Onions

Ingredients

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• 1 pound beef top sirloin steak
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• ¼ cup soy sauce
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• 2 tablespoons white sugar
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• 2 tablespoons cornstarch
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• ½ teaspoon ground ginger
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• 3 tablespoons vegetable oil, divided
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• 1 red onion, cut into 1-inch squares
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• 1 green bell pepper, cut into 1-inch squares
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• 2 tomatoes, cut into wedges
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Instructions

1. 1
   Slice steak into 1/2-inch thick slices across the grain.
2. 2
   Whisk together soy sauce, sugar, cornstarch, and ginger in a bowl until the sugar has dissolved and the mixture is smooth. Place steak slices into the marinade, and stir until well-coated.
3. 3
   Heat 1 tablespoon vegetable oil in a wok or large skillet over medium-high heat, and cook steak strips in batches in hot oil so as not to crowd the pan. Cook and stir until well-browned, about 3 minutes, and remove steak from the wok to a bowl. Repeat with remaining steak, adding more oil as needed, and set the cooked meat aside.
4. 4
   Return cooked steak strips to the hot wok, and stir in onion. Toss steak and onion together until onion begins to soften, about 2 minutes, then stir in green pepper.
5. 5
   Cook and stir the mixture until peppers have turned bright green and started to become tender, about 2 minutes more, then add tomatoes.
6. 6
   Stir everything together to mix and blend flavors, and serve.