Mix the cabbage, carrot, egg, flour, dashi powder and water in a large bowl until there are no lumps.
Heat oil in a pan over medium heat and spread one ladle full of batter in the pan in an oval shape.
When the edges start to dry, place a pair of chopsticks in the center and roll the okonomiyaki around them. Set aside and continue cooking the batter
Once you are done, put them all back in the pan, cover and cook over a low fire until done, then cook on the other side until golden brown.
Top with okonomiyaki sauce, mayonnaise, bonita flakes, Furikake and Aonori.