Slice the beef into thin strips, then toss with cornstarch to coat the pieces.
Heat 2 tablespoons of oil in a skillet over medium-high heat. Stir-fry the beef for 2-3 minutes, or until browned on the outside. Set aside.
In the same skillet, heat the remaining oil and sauté the finely chopped onion and minced garlic. Add the grated ginger and stir-fry for another 30 seconds.
Pour in the soy sauce, sugar, and water, then stir to combine. Bring to a boil and let the sauce thicken for 3-4 minutes.
Return the beef to the skillet and toss to coat with the sauce. Simmer over low heat for 5 minutes to allow the flavors to meld.
Garnish with chopped green onions and serve hot with steamed rice or stir-fried noodles.
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