01 - Combine beef with 1 tablespoon soy sauce and cornstarch in a medium bowl. Toss until coated and let rest for 10 minutes.
02 - Whisk together remaining soy sauce, oyster sauce, hoisin sauce, rice vinegar, sesame oil, sugar, garlic, ginger, black pepper, and water in a small bowl.
03 - Heat 1 tablespoon vegetable oil in a wok or large skillet over high heat. Add beef and stir fry for 2 to 3 minutes until browned but still slightly rare. Remove beef and set aside.
04 - Add remaining tablespoon of oil to the wok. Stir fry carrots for 2 minutes, then add snow peas and cook for 1 to 2 minutes until tender-crisp.
05 - Return beef to the wok, pour in the sauce, and toss everything together. Cook for 1 to 2 minutes until the sauce thickens and beef is fully cooked.
06 - Remove from heat, garnish with sliced scallions if desired, and serve immediately with steamed rice or noodles.