Cut rice cakes, fish cakes, and green onions into bite-sized pieces.
Pour water into a pan and add rice cakes and fish cakes.
Add gochujang (Korean chili paste), chili powder, sugar, soy sauce, and minced garlic, then bring to a boil.
Stir and simmer over medium heat until the rice cakes become soft.
Add green onions, boil once more, and serve.