
In a mixing bowl, combine sliced beef with ¼ teaspoon salt, pepper, 1 teaspoon garlic, 1 teaspoon cornstarch and 1 tablespoon water. Mix well and then add 1½ teaspoons cooking oil and give it another toss. Set aside to marinate for about 10 minutes.
Place a pan over medium heat and add cooking oil to coat the bottom. Once the oil is hot, add the beef and let it sear undisturbed briefly. Then stir-fry quickly and remove from the pan when the beef is still slightly pink.
Add the remaining minced garlic to the same pan and stir-fry until fragrant. Add carrot and stir-fry for about 2-3 minutes.
Continue to add asparagus to the pan and stir-fry together with the carrot for about 4 minutes until crisp-tender. You can add a tablespoon of water to the pan to help soften the vegetables if needed.
Return the beef to the pan and add the oyster sauce. Mix well. Once everything has been cooked through, add the fish sauce and adjust seasonings with a little more salt if needed. Give everything a final toss.
Transfer to serving plates and sprinkle with black pepper.