01 - Combine beef, soy sauce, Shaoxing wine, and cornstarch in a bowl. Toss to coat evenly and let rest for 10 minutes.
02 - Whisk together soy sauce, dark soy sauce, rice vinegar, hoisin sauce, sugar, sesame oil, water, and cornstarch until smooth. Set aside.
03 - Heat 1½ tablespoons of vegetable oil over high heat in a wok or large skillet. Add marinated beef in a single layer and sear for 1 to 2 minutes until browned but not fully cooked. Remove beef and keep warm.
04 - Add remaining oil to the wok. Stir-fry dried red chilies and Sichuan peppercorns for 30 seconds until fragrant without burning.
05 - Incorporate minced garlic, ginger, and the white parts of spring onions. Stir-fry for 1 minute to release aromas.
06 - Add diced red and green bell peppers. Stir-fry for 2 to 3 minutes until crisp-tender.
07 - Return seared beef to the wok. Pour in prepared sauce, stirring to coat ingredients evenly. Cook for 1 to 2 minutes until sauce thickens.
08 - Mix in roasted peanuts and green parts of spring onions. Toss well, then remove from heat.
09 - Serve immediately with steamed jasmine or brown rice.