In a medium bowl, combine beef, thinly sliced scallion, ginger, red-pepper flakes, tangerine zest, cornstarch, and salt; toss to coat. In a small bowl, combine tangerine juice, soy sauce, vinegar, sugar, and 2 tablespoons water.
Heat a large wok or skillet over high until hot. Add oil and swirl to coat wok. Add beef mixture and remaining scallions and cook, stirring constantly, until beef is browned, about 5 minutes. Add tangerine juice mixture; cook, stirring, until sauce is bubbling and slightly thickened, about 3 minutes. Serve over rice.
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