1.

Chop the onion and slice the meat for later use.

2.

Hot pan with cold oil, stir-fry until the meat slices change color.

3.

Add chopped green onion and saute until fragrant, and add some pepper.

4.

Pour in celery and stir-fry until it changes color.

5.

Pour in soy sauce and stir fry over high fire.

It can be cooked in a moment.