This is a homemade sauce for when you're panicking about having no okonomiyaki sauce left. This recipe is easier and quicker than buying it at the store and tastes far better. You won't ever need to buy it again.
Okonomiyaki and takoyaki are really fun and easy to make but don't you find that they're a bit plain if you don't cover them in the special sauce (Which happens to be really expensive)?
With this recipe you can make the sauce really quickly and it tastes better than anything store-bought! In fact, I think you can make this sauce for less than 1/3 the shop price.
This mixture should be 3 parts Japanese Worcestershire-style sauce to 1 part mentsuyu. My family like quite a sweet sauce so we add sugar. And my daughter loves adding ketchup. You can have lots of fun coming up with your own flavour. Using this recipe, I haven't had to buy sauce in around 10 years!!