You don't need to use Okonomiyaki Flour...
1 cup of flour
3/4 cup of dashi (japanese soup base) or water
Also okonomiyaki sauce is not the same as tonkatsu sauce.
But is a good substitute.
I love both preparation styles of Okonomiyaki. Osaka-fu that mixes all the ingredients and Hiroshima-fu that layers the ingredients.
Love to include yaki soba and lot of cabbage in mine : )
Woohoo all this talk about Okonomiyaki is getting me hungry!