Step 1

For the Chicken and Sauce: Combine chicken, 2 tablespoons soy sauce, cornstarch, rice wine, and white pepper in medium bowl and set aside. Stir vinegar, sugar, oil, and remaining 2 tablespoons soy sauce together in small bowl and set aside.

Step 2

For the Stir-Fry: Stir garlic, ginger, and 1 tablespoon oil together in second small bowl. Combine peanuts and 1 teaspoon oil in 12-inch nonstick skillet over medium-low heat. Cook, stirring constantly, until peanuts just begin to darken, 3 to 5 minutes. Transfer peanuts to plate and spread into even layer to cool. Return now-empty skillet to medium-low heat. Add remaining 1 tablespoon oil, arbols, and peppercorns and cook, stirring constantly, until arbols begin to darken, 1 to 2 minutes. Add garlic mixture and cook, stirring constantly, until all clumps are broken up and mixture is fragrant, about 30 seconds.

Step 3

Add chicken and spread into even layer. Cover skillet, increase heat to medium-high, and cook, without stirring, for 1 minute. Stir chicken and spread into even layer. Cover and cook, without stirring, for 1 minute. Add celery and cook uncovered, stirring frequently, until chickenis cooked through, 2 to 3 minutes. Add soy sauce mixture and cook, stirring constantly, until sauce is thickened and shiny and coats chicken, 3 to 5 minutes. Stir in scallions and peanuts. Transfer to platter and serve.