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1
Combine 2 tablespoons soy sauce and 1 teaspoon sugar in medium bowl. Add beef, toss well, and marinate for at least 10 minutes or up to 1 hour, stirring once.
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2
Sauce: Meanwhile, whisk remaining 2 tablespoons soy sauce, remaining tablespoon sugar, tangerine juice, sesame oil, and cornstarch in medium bowl.
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3
Zest-Garlic Mixture: Combine tangerine zest, garlic, ginger, black bean sauce, pepper flakes and 1 teaspoon vegetable oil in small bowl.
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4
Drain beef and discard liquid. Heat 1 teaspoon vegetable oil in 12-inch nonstick skillet or wok over high heat until just smoking. Add half of beef in single layer, breaking up clumps. Cook,without stirring, for 1 minute, then stir and cook until browned,1 to 2 minutes.
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5
Transfer beef to clean bowl. Heat 1 teaspoon vegetable oil in skillet and repeat with remaining beef. Rinse skillet and dry with paper towels.
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6
Add remaining tablespoon vegetable oil to now-empty skillet and heat until just smoking.
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7
Add onion and cook, stirring frequently, until beginning to brown, 3 to 5 minutes. Add snow peas and continue to cook until spotty brown, about 2 minutes longer. Add water and cook until vegetables are crisp-tender, about 1 minute.
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8
Push vegetables to sides of skillet; add zest-garlic mixture to clearing and cook, mashing with spatula, until fragrant, 15 to 20 seconds. Combine zest-garlic mixture with vegetables.
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9
Return beef and any juices to skillet and stir to combine. Whisk sauce to recombine, then add to skillet; cook, stirring constantly, until thickened, about 30 seconds. Serve.
