In a big bowl, place and mix together sirloin beef, shaoxing wine, sesame oil & black pepper.
Add cornstarch to the mixture and incorporate with rest of the ingredients. Set aside.
In a wok, heat oil over medium heat.
Add marinated beef and stir fry for 5 minutes. Remove from wok and set aside.
In the same wok, add oil.
Add bitter gourd/ampalaya and cook for 2 minutes.
Add oyster sauce and mix with ampalaya well, stir-fry for another minutes.
Add beef sirloin, combine with rest of ingredients and cook for another minute.
Serve and enjoy!
Inspired by Panlasang Pinoy