01 - Combine sliced beef with 1 tbsp soy sauce, Shaoxing wine, and cornstarch in a small bowl. Mix thoroughly and let marinate for 10 minutes at room temperature.
02 - Bring a pot of water to boil. Add green beans and cook for 2 minutes until bright green and just tender. Drain immediately and rinse under cold water to stop cooking. Set aside.
03 - Heat 1 tbsp vegetable oil in a large wok or skillet over high heat until smoking. Add marinated beef in a single layer and stir-fry for 2-3 minutes until browned but still pink inside. Remove beef and set aside.
04 - Add remaining 1 tbsp oil to the wok. Add Szechuan peppercorns and dried red chilies. Stir-fry for 30 seconds until fragrant and toasted, being careful not to burn them.
05 - Add garlic, ginger, and half the scallions to the wok. Stir-fry for 30 seconds until fragrant.
06 - Add blanched green beans to the wok. Stir-fry for 2-3 minutes until skins begin to blister and beans are tender-crisp.
07 - Return beef to the wok. Add chili bean paste, light soy sauce, dark soy sauce, black vinegar, sugar, and sesame oil. Toss everything together for 1-2 minutes until well coated and heated through.
08 - Transfer to a serving platter. Garnish with remaining scallions. Serve hot with steamed jasmine rice.