Clean the squid thoroughly and cut it into bite-sized pieces.
Julienne the onion, green onion, and carrot.
Heat cooking oil in a pan and sauté the garlic.
Add the prepared squid and vegetables, and stir-fry over high heat.
Add gochujang (Korean red chili paste), soy sauce, sugar, chili powder, and pepper; stir-fry until the seasoning is well mixed.
Finish by adding sesame oil and sesame seeds.