Cut the pork into bite-sized pieces.
Slice the onion and green onion thinly.
Heat oil in a pan and stir-fry the onion and green onion.
Add the pork and stir-fry.
Add gochujang (Korean chili paste), soy sauce, and minced garlic, then stir-fry over medium heat.
When the pork is cooked, transfer to a plate and serve.