Cut kirimochi into bite-sized pieces.
Slice onion and green onion thinly.
Add olive oil to a pan and stir-fry the onion and green onion.
Add kirimochi and cook over low heat until lightly browned.
Mix the tteokbokki sauce (gochujang, soy sauce, sugar, minced garlic, water) and add to the pan, mixing evenly.
Once all the ingredients are well combined, turn off the heat and plate the dish.