Place the cabbage, flour, baking powder, dashi powder, shallot and prawns in a large mixing bowl.
Add the egg and water and mix to combine all ingredients. At this stage it will look like there isn't enough batter to form a pancake. Don't worry, this is how it should look.
Heat a flat bottomed sandwich press and place a ladle of the mixture onto the hot base of the press.
Gently arrange the Okonomiyaki filling into a flat circle as it is cooking.
Allow the Okonomiyaki too cook for a few minutes then close the lid of the sandwich press to allow the top to cook. Do not open until the Okonomiyaki is ready.
Use an egg flip to remove the Okonomiyaki and place it onto a serving plate.
Topping
Squeeze the desired amount of Okonomiyaki Sauce over the pancake.
Add Japanese mayonnaise to the pancake, then sprinkle with Bonito flakes.