Cut the pork into bite-sized pieces.
Slice the onion and green onion thinly.
Mix gochujang, low-sugar soy sauce, and minced garlic to make the sauce.
Add the sauce to the pork and marinate for 10 minutes.
Heat low-sugar cooking oil in a pan and add the marinated pork and vegetables.
Stir-fry over medium heat until the pork is fully cooked.