Finely chop the cabbage and green onion.
In a bowl, mix flour, water, and egg.
Add cabbage, green onion, pork, and shrimp to the batter and mix well.
Add oil to a pan and spread the batter thinly. Cook one side until golden.
Flip and cook the other side until done.
Top the finished okonomiyaki with sauce, mayonnaise, and bonito flakes.