Before you start cooking, make sure to have all of your ingredients prepped and ready to go. Slice the beef thinly, mince the garlic cloves, chop the onion, slice the carrots into thin slices and cook the noodles with package instructions and set them aside.
Heat up 5 tablespoons of vegetable oil in a large wok or pan over medium-high heat. Once the oil is hot, add the garlic, onion and stir-fry for 1 minute until fragrant.
Add the beef slices to the wok and cook for 2 minutes until it is partially cooked. Then add the carrots, bean sprouts and cooked noodles.
Add the oyster sauce, soy sauce and sugar to the wok and stir-fry for 3 minutes until everything is combined and heated through.
Finally, add the pure sesame oil to the wok and mix everything together. Cook for another minute or two until all of the ingredients are cooked through.
Serve the Pho Ap Chao immediately while it is hot. You can garnish with freshly chopped green onion or cilantro if desired.