Clean the squid thoroughly, remove the innards, and cut into bite-sized pieces.
Slice the onion, carrot, and green onion into thin strips.
In a bowl, mix gochujang, soy sauce, chili powder, sugar, minced garlic, and sesame oil to make the sauce.
Add cooking oil to a pan and preheat over medium heat.
Add the squid and vegetables, stir-fry for 2 to 3 minutes.
Add the sauce and stir-fry quickly over high heat.
Sprinkle sesame seeds on top and plate to finish.