Clean and prepare the pollock thoroughly.
Finely chop Cheongyang peppers and onions.
Heat cooking oil in a pan and stir-fry the pollock.
Add the chopped Cheongyang peppers and onions and stir-fry together.
Make the sauce by adding soy sauce, gochujang, sugar, and minced garlic.
Add the sauce to the pollock and simmer.
Serve on a plate.