Finely chop the cabbage.
Mix flour, water, and eggs to make a batter.
Add the cabbage and other ingredients into the batter and mix well.
Heat oil in a pan over medium-low heat.
Spoon the batter onto the pan and spread it into a round shape.
Once one side is cooked, flip and cook the other side.
Cook both sides until golden brown and transfer to a plate.
Top with okonomiyaki sauce, mayonnaise, bonito flakes, green onions, and finish.