Cut the fish cake into bite-sized pieces.
Slice the onion and green onion thinly.
Heat cooking oil in a pan and stir-fry the onion and green onion.
Add the fish cake and stir-fry together.
Add gochujang, red pepper powder, soy sauce, oligosaccharide syrup, and water, then bring to a boil.
Finish cooking when the sauce is well absorbed into the ingredients.