01 - In a bowl, combine the sliced beef with 1 tablespoon soy sauce, cornstarch, and Shaoxing wine. Toss to coat evenly and let it marinate for 10 minutes.
02 - In a separate small bowl, mix all sauce ingredients thoroughly and set aside.
03 - Heat 1 tablespoon vegetable oil in a large wok or skillet over high heat. Add green beans and stir-fry for 4 to 5 minutes until blistered and tender. Remove from the pan and set aside.
04 - Add the remaining 1 tablespoon oil to the wok. Stir in Szechuan peppercorns, garlic, ginger, and the white parts of the spring onions. Cook while stirring for 30 seconds until fragrant.
05 - Add the marinated beef to the wok and stir-fry for 2 to 3 minutes until just browned.
06 - Return the green beans to the pan, add sliced red chilies if desired, and pour in the prepared sauce. Stir-fry all ingredients together for 1 to 2 minutes until everything is evenly coated and heated through.
07 - Garnish with the green parts of the spring onions and serve immediately with steamed jasmine or basmati rice.