Cut pork into bite-sized pieces.
Cut onion, green onion, and kimchi into pieces that are easy to eat.
Season the pork with chili powder, sugar, soy sauce, and minced garlic.
Heat oil in a pan and stir-fry the pork.
When the pork is about halfway cooked, add kimchi and onion, and stir-fry together.
Add green onion and pepper, and continue stir-frying until well seasoned.
When all ingredients are cooked through, turn off the heat and transfer to a plate.