Cut the rice cakes and fish cakes into bite-sized pieces.
Slice the onion thinly.
Add 200ml water, gochujang, gochugaru, and soy sauce to a pan and bring to a boil.
Add onion, rice cakes, and fish cakes, then cook over medium heat.
When the rice cakes become soft, add green onion and cook for 2 more minutes.
Finish by adding boiled eggs to taste.