To a mixing bowl, add beef slices, ¼ teaspoon salt, ¼ teaspoon black pepper, ½ teaspoon minced garlic and 1 teaspoon oil. Toss well and set aside to marinate while preparing the bamboo shoots.
Remove fresh bamboo shoots from the package and discard liquid in the package. Rinse and then boil in plenty of water to remove strong smell and bitterness. This can take 5-10 minutes of even up to 30 minutes. Then either shred or slice into thin strips.
Place a pan over medium-high heat and add some cooking oil to coat the bottom. Once the oil is hot, add beef slices in a single layer and let them cook undisturbed for about 20-30 seconds. Then stir-fry for a few more seconds and transfer to a plate while the beef is still slightly pink.
Return the pan to medium heat and add some more oil. Sauté the remaining garlic briefly until fragrant. Then add the shredded bamboo shoots. Stir and cook for a minute.
Add the remaining salt, oyster sauce and soy sauce. Stir and cook the bamboo shoots for another 3-4 minutes until they have absorbed the seasonings and become flavorful.
Add the beef back to the pan. Add the fish sauce and stir everything thoroughly. Taste and adjust seasonings to your liking.
Stir in chopped scallion and some more black pepper. Give everything a quick toss and then transfer to a serving plate. Squeeze some lime juice over the dish if desired and serve right away.