01 - In a bowl, combine sliced beef with 1 tbsp soy sauce, 1 tsp cornstarch, and 1 tsp sesame oil. Mix thoroughly and let rest for 10 minutes.
02 - In a separate bowl, whisk together soy sauce, oyster sauce, hoisin sauce, rice vinegar, brown sugar, garlic, ginger, cornstarch, and water until smooth. Set aside.
03 - Heat 1 tbsp vegetable oil in a large wok or skillet over high heat. Add marinated beef in a single layer and stir-fry for 2 to 3 minutes until browned. Remove beef and set aside.
04 - Add remaining 1 tbsp vegetable oil to the wok. Stir-fry carrots for 2 minutes, then add snow peas and continue cooking for another 2 minutes until crisp-tender.
05 - Return beef to the wok and pour in prepared sauce. Stir well and cook for 1 to 2 minutes until sauce thickens and evenly coats ingredients.
06 - Remove from heat and garnish with sliced spring onions if desired. Serve immediately over steamed rice or noodles.