Cut the pork into bite-sized pieces.
Julienne the onion and green onion.
Heat cooking oil in a pan and stir-fry the pork.
When the pork starts to cook, add the onion and green onion and stir-fry together.
Season with soy sauce, red pepper powder, and minced garlic, then mix well and stir-fry.
Once all the ingredients are cooked, transfer to a plate and serve.