Finely chop cabbage and carrot.
Soak the oatmeal in water.
In a bowl, mix oatmeal, chopped vegetables, eggs, salt, and pepper.
Heat cooking oil in a pan and place dollops of the batter in a round shape.
Cook on medium-low heat until golden brown on both sides.
Transfer to a plate and top with okonomiyaki sauce, mayonnaise, and bonito flakes.