01 - In a medium bowl, combine beef with soy sauce, cornstarch, and sesame oil. Toss thoroughly and let marinate for 10 minutes.
02 - Combine all sauce ingredients in a small bowl and set aside.
03 - Heat 1 tablespoon vegetable oil in a large wok or skillet over high heat. Add beef in a single layer; sear 1 to 2 minutes per side until browned. Transfer to a plate.
04 - Add remaining 1 tablespoon vegetable oil to the wok. Stir-fry garlic, ginger, and white parts of spring onions for 30 seconds until fragrant.
05 - Add carrots to the wok; stir-fry for 2 minutes. Add snow peas and stir-fry for 1 to 2 minutes until vegetables are tender-crisp.
06 - Return beef to the wok. Pour in sauce. Toss thoroughly and stir-fry for 1 to 2 minutes until sauce thickens slightly and beef is cooked through.
07 - Sprinkle green parts of the spring onions on top. Serve immediately, optionally with steamed rice.