Soak pollack strips in water and cut into bite-sized pieces.
Slice the onion and green onion.
Heat sesame oil in a pan and stir-fry the pollack.
Add water, gochujang, soy sauce, minced garlic, and sugar; bring to a boil.
Add onion and green onion, and simmer.
When the sauce is reduced, finish with sesame oil and toasted sesame seeds.