Wash the konjac thoroughly and cut it into bite-sized pieces.
Cut onion, green onion, and fish cake (low-calorie option) into bite-sized pieces.
Mix the tteokbokki sauce with water and prepare it.
Add konjac, onion, green onion, and fish cake to a pan and stir-fry lightly.
Pour in the prepared sauce and simmer over medium heat.
Stir and cook until the sauce thickens.
Add diet noodles (such as konjac noodles) and simmer for another 2-3 minutes.
Optionally, add boiled eggs or cheese to taste.