Cut rice cakes and fish cakes into bite-sized pieces.
Thinly slice the onion.
Heat cooking oil in a pan and sauté the onion.
Add the rice cakes and fish cakes, and stir-fry together.
Pour in water, then add gochujang, chili powder, sugar, and soy sauce. Bring to a boil.
When the rice cakes become soft, crack and beat the eggs, then pour them into the pan.
Stir well and simmer until the eggs are cooked.
Garnish with green onion and sesame seeds to finish.