01 - Combine sliced beef, 1 tbsp soy sauce, cornstarch, and sesame oil in a bowl. Mix thoroughly and set aside to marinate.
02 - Beat eggs with a pinch of salt in a small bowl until well combined.
03 - Heat 1 tbsp oil in a large wok or deep skillet over high heat. Stir-fry beef for 2 minutes until just browned, then remove and set aside.
04 - Add another 1 tbsp oil to the wok. Stir-fry garlic and the white parts of spring onions for 30 seconds until fragrant.
05 - Add diced carrot, frozen peas, and diced red bell pepper. Stir-fry for 2 to 3 minutes until vegetables are tender-crisp.
06 - Push vegetables to the side of the wok and pour in beaten eggs. Scramble briefly then combine with the vegetables.
07 - Incorporate cold cooked rice, breaking up any clumps. Stir-fry for 2 minutes until heated through.
08 - Return beef to the pan. Add soy sauce, oyster sauce, optional fish sauce, and white pepper. Stir-fry for 2 to 3 minutes until fully incorporated and hot.
09 - Adjust salt if needed. Stir in green parts of spring onions just before serving.