Cut the pork and vegetables into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the pork.
Add onion and green onion, and stir-fry together.
Add gochujang, red pepper flakes, sugar, and minced garlic, and continue stir-frying.
Pour in soy sauce and water, and cook until the seasoning is evenly absorbed.
Finish with a drizzle of sesame oil and a sprinkle of sesame seeds.