Finely chop tofu, chives, carrot, and shiitake mushrooms.
Add soy sauce and pepper to the chopped ingredients to make the dumpling filling.
Place the filling on the dumpling wrappers and shape the dumplings.
Rinse the rice cakes for soup under running water.
Add kelp and anchovies to a pot and boil to make broth.
Add the rice cakes and dumplings to the broth and boil.
Season with soup soy sauce to taste.
Top the finished tteok mandu soup with chopped scallions.