Wash the squid and whole garlic thoroughly, then cut the squid into bite-sized pieces.
Add cooking oil to a pan and stir-fry the whole garlic first.
Once the garlic turns golden, add the squid and stir-fry over high heat.
Season with soy sauce, gochujang (Korean chili paste), sugar, and chili powder.
Add onion and green onion, and stir-fry quickly.
When all ingredients are cooked, turn off the heat and drizzle with sesame oil.
Finish by sprinkling with toasted sesame seeds.