Combine beef, orange juice, rice vinegar, soy sauce, hot chili paste, brown sugar, and garlic in a large bowl. Cover and refrigerate for 1 to 2 hours.
Strain beef in a colander set over a large bowl, allowing beef to drain thoroughly, about 5 minutes. Reserve marinade.
Stir water and cornstarch into the bowl of marinade. Whisk until cornstarch is dissolved, set aside.
Spray skillet with cooking spray and place over high heat. Cook beef for 1 minute without stirring; cook and stir for an additional minute.
Stir in light parts of green onion and orange zest; cook for 30 seconds.
Stir in marinade and green onion tops; cook and stir until beef is no longer pink inside and sauce is reduced and thick, about 2 to 3 minutes.
Season with salt and black pepper to taste.
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