Clean and cut the squid into bite-sized pieces.
Julienne the onion, green onion, and carrot.
Heat oil in a pan and stir-fry the onion, green onion, and carrot.
Add the squid and stir-fry quickly over high heat.
Blanch the udon noodles in boiling water, then add them to the pan.
Add gochujang (Korean chili paste), soy sauce, chili powder, sugar, minced garlic, and pepper, then stir-fry.
Once everything is evenly mixed, remove from heat and serve on a plate.