01 - Combine the sliced beef with 2 tbsp soy sauce, 1 tbsp cornstarch, and 1 tsp sesame oil in a bowl. Mix thoroughly and let marinate for at least 10 minutes to tenderize and flavor the meat.
02 - Whisk together all sauce ingredients in a small bowl: 3 tbsp soy sauce, 2 tbsp oyster sauce, 1 tbsp rice vinegar, 1 tbsp brown sugar, 2 tbsp water, and 1 tsp cornstarch until fully dissolved. Set aside for later use.
03 - Heat 1 tbsp vegetable oil in a large wok or skillet over high heat until smoking. Add the marinated beef in a single layer and sear for 1–2 minutes until browned but still slightly pink in the center. Remove beef to a plate, leaving any juices behind.
04 - Add the remaining 1 tbsp oil to the wok. Stir fry the garlic, ginger, and white parts of the spring onions for 30 seconds until fragrant, being careful not to burn the garlic.
05 - Add the carrots and stir fry for 1 minute. Add the snow peas and continue stir frying for 2 minutes until vegetables are tender-crisp and bright in color.
06 - Return the beef and accumulated juices to the wok. Pour in the prepared sauce and toss everything together for 2–3 minutes until the sauce thickens and coats all ingredients. The beef should be cooked through.
07 - Remove from heat immediately. Garnish with the reserved green onion tops. Serve hot while vegetables retain their crunch, accompanied by steamed jasmine rice or noodles.